diff --git a/chromeos_update_engine/update_metadata.pb.go b/chromeos_update_engine/update_metadata.pb.go
index 4b3fe8c..8c4face 100644
--- a/chromeos_update_engine/update_metadata.pb.go
+++ b/chromeos_update_engine/update_metadata.pb.go
@@ -13,6 +13,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 //
+
 // Update file format: An update file contains all the operations needed
 // to update a system to a specific version. It can be a full payload which
 // can update from any version, or a delta payload which can only update
@@ -48,11 +49,14 @@
 //   char payload_signatures_message[payload_signatures_message_size];
 //
 // };
+
 // The DeltaArchiveManifest protobuf is an ordered list of InstallOperation
 // objects. These objects are stored in a linear array in the
 // DeltaArchiveManifest. Each operation is applied in order by the client.
+
 // The DeltaArchiveManifest also contains the initial and final
 // checksums for the device.
+
 // The client will perform each InstallOperation in order, beginning even
 // before the entire delta file is downloaded (but after at least the
 // protobuf is downloaded). The types of operations are explained:
@@ -87,8 +91,8 @@
 
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.34.2
-// 	protoc        v5.27.1
+// 	protoc-gen-go v1.32.0
+// 	protoc        v3.21.12
 // source: update_metadata.proto
 
 package chromeos_update_engine
@@ -128,6 +132,12 @@ const (
 	InstallOperation_BROTLI_BSDIFF InstallOperation_Type = 10 // Like SOURCE_BSDIFF, but compressed with brotli.
 	// On minor version 5 or newer, these operations are supported:
 	InstallOperation_PUFFDIFF InstallOperation_Type = 9 // The data is in puffdiff format.
+	// On minor version 8 or newer, these operations are supported:
+	InstallOperation_ZUCCHINI InstallOperation_Type = 11
+	// On minor version 9 or newer, these operations are supported:
+	InstallOperation_LZ4DIFF_BSDIFF   InstallOperation_Type = 12
+	InstallOperation_LZ4DIFF_PUFFDIFF InstallOperation_Type = 13
+	InstallOperation_ZSTD             InstallOperation_Type = 14
 )
 
 // Enum value maps for InstallOperation_Type.
@@ -144,19 +154,27 @@ var (
 		7:  "DISCARD",
 		10: "BROTLI_BSDIFF",
 		9:  "PUFFDIFF",
+		11: "ZUCCHINI",
+		12: "LZ4DIFF_BSDIFF",
+		13: "LZ4DIFF_PUFFDIFF",
+		14: "ZSTD",
 	}
 	InstallOperation_Type_value = map[string]int32{
-		"REPLACE":       0,
-		"REPLACE_BZ":    1,
-		"MOVE":          2,
-		"BSDIFF":        3,
-		"SOURCE_COPY":   4,
-		"SOURCE_BSDIFF": 5,
-		"REPLACE_XZ":    8,
-		"ZERO":          6,
-		"DISCARD":       7,
-		"BROTLI_BSDIFF": 10,
-		"PUFFDIFF":      9,
+		"REPLACE":          0,
+		"REPLACE_BZ":       1,
+		"MOVE":             2,
+		"BSDIFF":           3,
+		"SOURCE_COPY":      4,
+		"SOURCE_BSDIFF":    5,
+		"REPLACE_XZ":       8,
+		"ZERO":             6,
+		"DISCARD":          7,
+		"BROTLI_BSDIFF":    10,
+		"PUFFDIFF":         9,
+		"ZUCCHINI":         11,
+		"LZ4DIFF_BSDIFF":   12,
+		"LZ4DIFF_PUFFDIFF": 13,
+		"ZSTD":             14,
 	}
 )
 
@@ -194,22 +212,28 @@ func (x *InstallOperation_Type) UnmarshalJSON(b []byte) error {
 
 // Deprecated: Use InstallOperation_Type.Descriptor instead.
 func (InstallOperation_Type) EnumDescriptor() ([]byte, []int) {
-	return file_update_metadata_proto_rawDescGZIP(), []int{4, 0}
+	return file_update_metadata_proto_rawDescGZIP(), []int{3, 0}
 }
 
 type CowMergeOperation_Type int32
 
 const (
-	CowMergeOperation_COW_COPY CowMergeOperation_Type = 0 // identical blocks
+	CowMergeOperation_COW_COPY    CowMergeOperation_Type = 0 // identical blocks
+	CowMergeOperation_COW_XOR     CowMergeOperation_Type = 1 // used when src/dst blocks are highly similar
+	CowMergeOperation_COW_REPLACE CowMergeOperation_Type = 2 // Raw replace operation
 )
 
 // Enum value maps for CowMergeOperation_Type.
 var (
 	CowMergeOperation_Type_name = map[int32]string{
 		0: "COW_COPY",
+		1: "COW_XOR",
+		2: "COW_REPLACE",
 	}
 	CowMergeOperation_Type_value = map[string]int32{
-		"COW_COPY": 0,
+		"COW_COPY":    0,
+		"COW_XOR":     1,
+		"COW_REPLACE": 2,
 	}
 )
 
@@ -247,21 +271,9 @@ func (x *CowMergeOperation_Type) UnmarshalJSON(b []byte) error {
 
 // Deprecated: Use CowMergeOperation_Type.Descriptor instead.
 func (CowMergeOperation_Type) EnumDescriptor() ([]byte, []int) {
-	return file_update_metadata_proto_rawDescGZIP(), []int{5, 0}
-}
-
-// Data is packed into blocks on disk, always starting from the beginning
-// of the block. If a file's data is too large for one block, it overflows
-// into another block, which may or may not be the following block on the
-// physical partition. An ordered list of extents is another
-// representation of an ordered list of blocks. For example, a file stored
-// in blocks 9, 10, 11, 2, 18, 12 (in that order) would be stored in
-// extents { {9, 3}, {2, 1}, {18, 1}, {12, 1} } (in that order).
-// In general, files are stored sequentially on disk, so it's more efficient
-// to use extents to encode the block lists (this is effectively
-// run-length encoding).
-// A sentinel value (kuint64max) as the start block denotes a sparse-hole
-// in a file whose block-length is specified by num_blocks.
+	return file_update_metadata_proto_rawDescGZIP(), []int{4, 0}
+}
+
 type Extent struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -317,17 +329,6 @@ func (x *Extent) GetNumBlocks() uint64 {
 	return 0
 }
 
-// Signatures: Updates may be signed by the OS vendor. The client verifies
-// an update's signature by hashing the entire download. The section of the
-// download that contains the signature is at the end of the file, so when
-// signing a file, only the part up to the signature part is signed.
-// Then, the client looks inside the download's Signatures message for a
-// Signature message that it knows how to handle. Generally, a client will
-// only know how to handle one type of signature, but an update may contain
-// many signatures to support many different types of client. Then client
-// selects a Signature message and uses that, along with a known public key,
-// to verify the download. The public key is expected to be part of the
-// client.
 type Signatures struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -430,103 +431,6 @@ func (x *PartitionInfo) GetHash() []byte {
 	return nil
 }
 
-// Describe an image we are based on in a human friendly way.
-// Examples:
-//
-//	dev-channel, x86-alex, 1.2.3, mp-v3
-//	nplusone-channel, x86-alex, 1.2.4, mp-v3, dev-channel, 1.2.3
-//
-// All fields will be set, if this message is present.
-type ImageInfo struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	Board   *string `protobuf:"bytes,1,opt,name=board" json:"board,omitempty"`
-	Key     *string `protobuf:"bytes,2,opt,name=key" json:"key,omitempty"`
-	Channel *string `protobuf:"bytes,3,opt,name=channel" json:"channel,omitempty"`
-	Version *string `protobuf:"bytes,4,opt,name=version" json:"version,omitempty"`
-	// If these values aren't present, they should be assumed to match
-	// the equivalent value above. They are normally only different for
-	// special image types such as nplusone images.
-	BuildChannel *string `protobuf:"bytes,5,opt,name=build_channel,json=buildChannel" json:"build_channel,omitempty"`
-	BuildVersion *string `protobuf:"bytes,6,opt,name=build_version,json=buildVersion" json:"build_version,omitempty"`
-}
-
-func (x *ImageInfo) Reset() {
-	*x = ImageInfo{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_update_metadata_proto_msgTypes[3]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *ImageInfo) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*ImageInfo) ProtoMessage() {}
-
-func (x *ImageInfo) ProtoReflect() protoreflect.Message {
-	mi := &file_update_metadata_proto_msgTypes[3]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use ImageInfo.ProtoReflect.Descriptor instead.
-func (*ImageInfo) Descriptor() ([]byte, []int) {
-	return file_update_metadata_proto_rawDescGZIP(), []int{3}
-}
-
-func (x *ImageInfo) GetBoard() string {
-	if x != nil && x.Board != nil {
-		return *x.Board
-	}
-	return ""
-}
-
-func (x *ImageInfo) GetKey() string {
-	if x != nil && x.Key != nil {
-		return *x.Key
-	}
-	return ""
-}
-
-func (x *ImageInfo) GetChannel() string {
-	if x != nil && x.Channel != nil {
-		return *x.Channel
-	}
-	return ""
-}
-
-func (x *ImageInfo) GetVersion() string {
-	if x != nil && x.Version != nil {
-		return *x.Version
-	}
-	return ""
-}
-
-func (x *ImageInfo) GetBuildChannel() string {
-	if x != nil && x.BuildChannel != nil {
-		return *x.BuildChannel
-	}
-	return ""
-}
-
-func (x *ImageInfo) GetBuildVersion() string {
-	if x != nil && x.BuildVersion != nil {
-		return *x.BuildVersion
-	}
-	return ""
-}
-
 type InstallOperation struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -567,7 +471,7 @@ type InstallOperation struct {
 func (x *InstallOperation) Reset() {
 	*x = InstallOperation{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_update_metadata_proto_msgTypes[4]
+		mi := &file_update_metadata_proto_msgTypes[3]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -580,7 +484,7 @@ func (x *InstallOperation) String() string {
 func (*InstallOperation) ProtoMessage() {}
 
 func (x *InstallOperation) ProtoReflect() protoreflect.Message {
-	mi := &file_update_metadata_proto_msgTypes[4]
+	mi := &file_update_metadata_proto_msgTypes[3]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -593,7 +497,7 @@ func (x *InstallOperation) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use InstallOperation.ProtoReflect.Descriptor instead.
 func (*InstallOperation) Descriptor() ([]byte, []int) {
-	return file_update_metadata_proto_rawDescGZIP(), []int{4}
+	return file_update_metadata_proto_rawDescGZIP(), []int{3}
 }
 
 func (x *InstallOperation) GetType() InstallOperation_Type {
@@ -673,12 +577,20 @@ type CowMergeOperation struct {
 	Type      *CowMergeOperation_Type `protobuf:"varint,1,opt,name=type,enum=chromeos_update_engine.CowMergeOperation_Type" json:"type,omitempty"`
 	SrcExtent *Extent                 `protobuf:"bytes,2,opt,name=src_extent,json=srcExtent" json:"src_extent,omitempty"`
 	DstExtent *Extent                 `protobuf:"bytes,3,opt,name=dst_extent,json=dstExtent" json:"dst_extent,omitempty"`
+	// For COW_XOR, source location might be unaligned, so this field is in range
+	// [0, block_size), representing how much should the src_extent shift toward
+	// larger block number. If this field is non-zero, then src_extent will
+	// include 1 extra block in the end, as the merge op actually references the
+	// first |src_offset| bytes of that extra block. For example, if |dst_extent|
+	// is [10, 15], |src_offset| is 500, then src_extent might look like [25, 31].
+	// Note that |src_extent| contains 1 extra block than the |dst_extent|.
+	SrcOffset *uint32 `protobuf:"varint,4,opt,name=src_offset,json=srcOffset" json:"src_offset,omitempty"`
 }
 
 func (x *CowMergeOperation) Reset() {
 	*x = CowMergeOperation{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_update_metadata_proto_msgTypes[5]
+		mi := &file_update_metadata_proto_msgTypes[4]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -691,7 +603,7 @@ func (x *CowMergeOperation) String() string {
 func (*CowMergeOperation) ProtoMessage() {}
 
 func (x *CowMergeOperation) ProtoReflect() protoreflect.Message {
-	mi := &file_update_metadata_proto_msgTypes[5]
+	mi := &file_update_metadata_proto_msgTypes[4]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -704,7 +616,7 @@ func (x *CowMergeOperation) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use CowMergeOperation.ProtoReflect.Descriptor instead.
 func (*CowMergeOperation) Descriptor() ([]byte, []int) {
-	return file_update_metadata_proto_rawDescGZIP(), []int{5}
+	return file_update_metadata_proto_rawDescGZIP(), []int{4}
 }
 
 func (x *CowMergeOperation) GetType() CowMergeOperation_Type {
@@ -728,6 +640,13 @@ func (x *CowMergeOperation) GetDstExtent() *Extent {
 	return nil
 }
 
+func (x *CowMergeOperation) GetSrcOffset() uint32 {
+	if x != nil && x.SrcOffset != nil {
+		return *x.SrcOffset
+	}
+	return 0
+}
+
 // Describes the update to apply to a single partition.
 type PartitionUpdate struct {
 	state         protoimpl.MessageState
@@ -765,7 +684,6 @@ type PartitionUpdate struct {
 	// Whether a failure in the postinstall step for this partition should be
 	// ignored.
 	PostinstallOptional *bool `protobuf:"varint,9,opt,name=postinstall_optional,json=postinstallOptional" json:"postinstall_optional,omitempty"`
-	// On minor version 6 or newer, these fields are supported:
 	// The extent for data covered by verity hash tree.
 	HashTreeDataExtent *Extent `protobuf:"bytes,10,opt,name=hash_tree_data_extent,json=hashTreeDataExtent" json:"hash_tree_data_extent,omitempty"`
 	// The extent to store verity hash tree.
@@ -788,6 +706,13 @@ type PartitionUpdate struct {
 	// skip writing the raw bytes for these extents. During snapshot merge, the
 	// bytes will read from the source partitions instead.
 	MergeOperations []*CowMergeOperation `protobuf:"bytes,18,rep,name=merge_operations,json=mergeOperations" json:"merge_operations,omitempty"`
+	// Estimated size for COW image. This is used by libsnapshot
+	// as a hint. If set to 0, libsnapshot should use alternative
+	// methods for estimating size.
+	EstimateCowSize *uint64 `protobuf:"varint,19,opt,name=estimate_cow_size,json=estimateCowSize" json:"estimate_cow_size,omitempty"`
+	// Information about the cow used by Cow Writer to specify
+	// number of cow operations to be written
+	EstimateOpCountMax *uint64 `protobuf:"varint,20,opt,name=estimate_op_count_max,json=estimateOpCountMax" json:"estimate_op_count_max,omitempty"`
 }
 
 // Default values for PartitionUpdate fields.
@@ -798,7 +723,7 @@ const (
 func (x *PartitionUpdate) Reset() {
 	*x = PartitionUpdate{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_update_metadata_proto_msgTypes[6]
+		mi := &file_update_metadata_proto_msgTypes[5]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -811,7 +736,7 @@ func (x *PartitionUpdate) String() string {
 func (*PartitionUpdate) ProtoMessage() {}
 
 func (x *PartitionUpdate) ProtoReflect() protoreflect.Message {
-	mi := &file_update_metadata_proto_msgTypes[6]
+	mi := &file_update_metadata_proto_msgTypes[5]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -824,7 +749,7 @@ func (x *PartitionUpdate) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use PartitionUpdate.ProtoReflect.Descriptor instead.
 func (*PartitionUpdate) Descriptor() ([]byte, []int) {
-	return file_update_metadata_proto_rawDescGZIP(), []int{6}
+	return file_update_metadata_proto_rawDescGZIP(), []int{5}
 }
 
 func (x *PartitionUpdate) GetPartitionName() string {
@@ -953,6 +878,20 @@ func (x *PartitionUpdate) GetMergeOperations() []*CowMergeOperation {
 	return nil
 }
 
+func (x *PartitionUpdate) GetEstimateCowSize() uint64 {
+	if x != nil && x.EstimateCowSize != nil {
+		return *x.EstimateCowSize
+	}
+	return 0
+}
+
+func (x *PartitionUpdate) GetEstimateOpCountMax() uint64 {
+	if x != nil && x.EstimateOpCountMax != nil {
+		return *x.EstimateOpCountMax
+	}
+	return 0
+}
+
 type DynamicPartitionGroup struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -970,7 +909,7 @@ type DynamicPartitionGroup struct {
 func (x *DynamicPartitionGroup) Reset() {
 	*x = DynamicPartitionGroup{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_update_metadata_proto_msgTypes[7]
+		mi := &file_update_metadata_proto_msgTypes[6]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -983,7 +922,7 @@ func (x *DynamicPartitionGroup) String() string {
 func (*DynamicPartitionGroup) ProtoMessage() {}
 
 func (x *DynamicPartitionGroup) ProtoReflect() protoreflect.Message {
-	mi := &file_update_metadata_proto_msgTypes[7]
+	mi := &file_update_metadata_proto_msgTypes[6]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -996,7 +935,7 @@ func (x *DynamicPartitionGroup) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use DynamicPartitionGroup.ProtoReflect.Descriptor instead.
 func (*DynamicPartitionGroup) Descriptor() ([]byte, []int) {
-	return file_update_metadata_proto_rawDescGZIP(), []int{7}
+	return file_update_metadata_proto_rawDescGZIP(), []int{6}
 }
 
 func (x *DynamicPartitionGroup) GetName() string {
@@ -1020,6 +959,61 @@ func (x *DynamicPartitionGroup) GetPartitionNames() []string {
 	return nil
 }
 
+type VABCFeatureSet struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Threaded    *bool `protobuf:"varint,1,opt,name=threaded" json:"threaded,omitempty"`
+	BatchWrites *bool `protobuf:"varint,2,opt,name=batch_writes,json=batchWrites" json:"batch_writes,omitempty"`
+}
+
+func (x *VABCFeatureSet) Reset() {
+	*x = VABCFeatureSet{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_update_metadata_proto_msgTypes[7]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *VABCFeatureSet) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*VABCFeatureSet) ProtoMessage() {}
+
+func (x *VABCFeatureSet) ProtoReflect() protoreflect.Message {
+	mi := &file_update_metadata_proto_msgTypes[7]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use VABCFeatureSet.ProtoReflect.Descriptor instead.
+func (*VABCFeatureSet) Descriptor() ([]byte, []int) {
+	return file_update_metadata_proto_rawDescGZIP(), []int{7}
+}
+
+func (x *VABCFeatureSet) GetThreaded() bool {
+	if x != nil && x.Threaded != nil {
+		return *x.Threaded
+	}
+	return false
+}
+
+func (x *VABCFeatureSet) GetBatchWrites() bool {
+	if x != nil && x.BatchWrites != nil {
+		return *x.BatchWrites
+	}
+	return false
+}
+
 // Metadata related to all dynamic partitions.
 type DynamicPartitionMetadata struct {
 	state         protoimpl.MessageState
@@ -1038,6 +1032,23 @@ type DynamicPartitionMetadata struct {
 	// partitions if possible. If this is unset, the update_engine daemon MUST
 	// NOT create snapshots for dynamic partitions.
 	SnapshotEnabled *bool `protobuf:"varint,2,opt,name=snapshot_enabled,json=snapshotEnabled" json:"snapshot_enabled,omitempty"`
+	// If this is set to false, update_engine should not use VABC regardless. If
+	// this is set to true, update_engine may choose to use VABC if device
+	// supports it, but not guaranteed.
+	// VABC stands for Virtual AB Compression
+	VabcEnabled *bool `protobuf:"varint,3,opt,name=vabc_enabled,json=vabcEnabled" json:"vabc_enabled,omitempty"`
+	// The compression algorithm used by VABC. Available ones are "gz", "brotli".
+	// See system/core/fs_mgr/libsnapshot/cow_writer.cpp for available options,
+	// as this parameter is ultimated forwarded to libsnapshot's CowWriter
+	VabcCompressionParam *string `protobuf:"bytes,4,opt,name=vabc_compression_param,json=vabcCompressionParam" json:"vabc_compression_param,omitempty"`
+	// COW version used by VABC. The represents the major version in the COW
+	// header
+	CowVersion *uint32 `protobuf:"varint,5,opt,name=cow_version,json=cowVersion" json:"cow_version,omitempty"`
+	// A collection of knobs to tune Virtual AB Compression
+	VabcFeatureSet *VABCFeatureSet `protobuf:"bytes,6,opt,name=vabc_feature_set,json=vabcFeatureSet" json:"vabc_feature_set,omitempty"`
+	// Max bytes to be compressed at once during ota. Options: 4k, 8k, 16k, 32k,
+	// 64k, 128k
+	CompressionFactor *uint64 `protobuf:"varint,7,opt,name=compression_factor,json=compressionFactor" json:"compression_factor,omitempty"`
 }
 
 func (x *DynamicPartitionMetadata) Reset() {
@@ -1086,19 +1097,168 @@ func (x *DynamicPartitionMetadata) GetSnapshotEnabled() bool {
 	return false
 }
 
+func (x *DynamicPartitionMetadata) GetVabcEnabled() bool {
+	if x != nil && x.VabcEnabled != nil {
+		return *x.VabcEnabled
+	}
+	return false
+}
+
+func (x *DynamicPartitionMetadata) GetVabcCompressionParam() string {
+	if x != nil && x.VabcCompressionParam != nil {
+		return *x.VabcCompressionParam
+	}
+	return ""
+}
+
+func (x *DynamicPartitionMetadata) GetCowVersion() uint32 {
+	if x != nil && x.CowVersion != nil {
+		return *x.CowVersion
+	}
+	return 0
+}
+
+func (x *DynamicPartitionMetadata) GetVabcFeatureSet() *VABCFeatureSet {
+	if x != nil {
+		return x.VabcFeatureSet
+	}
+	return nil
+}
+
+func (x *DynamicPartitionMetadata) GetCompressionFactor() uint64 {
+	if x != nil && x.CompressionFactor != nil {
+		return *x.CompressionFactor
+	}
+	return 0
+}
+
+// Definition has been duplicated from
+// $ANDROID_BUILD_TOP/build/tools/releasetools/ota_metadata.proto. Keep in sync.
+type ApexInfo struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	PackageName      *string `protobuf:"bytes,1,opt,name=package_name,json=packageName" json:"package_name,omitempty"`
+	Version          *int64  `protobuf:"varint,2,opt,name=version" json:"version,omitempty"`
+	IsCompressed     *bool   `protobuf:"varint,3,opt,name=is_compressed,json=isCompressed" json:"is_compressed,omitempty"`
+	DecompressedSize *int64  `protobuf:"varint,4,opt,name=decompressed_size,json=decompressedSize" json:"decompressed_size,omitempty"`
+}
+
+func (x *ApexInfo) Reset() {
+	*x = ApexInfo{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_update_metadata_proto_msgTypes[9]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ApexInfo) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ApexInfo) ProtoMessage() {}
+
+func (x *ApexInfo) ProtoReflect() protoreflect.Message {
+	mi := &file_update_metadata_proto_msgTypes[9]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ApexInfo.ProtoReflect.Descriptor instead.
+func (*ApexInfo) Descriptor() ([]byte, []int) {
+	return file_update_metadata_proto_rawDescGZIP(), []int{9}
+}
+
+func (x *ApexInfo) GetPackageName() string {
+	if x != nil && x.PackageName != nil {
+		return *x.PackageName
+	}
+	return ""
+}
+
+func (x *ApexInfo) GetVersion() int64 {
+	if x != nil && x.Version != nil {
+		return *x.Version
+	}
+	return 0
+}
+
+func (x *ApexInfo) GetIsCompressed() bool {
+	if x != nil && x.IsCompressed != nil {
+		return *x.IsCompressed
+	}
+	return false
+}
+
+func (x *ApexInfo) GetDecompressedSize() int64 {
+	if x != nil && x.DecompressedSize != nil {
+		return *x.DecompressedSize
+	}
+	return 0
+}
+
+// Definition has been duplicated from
+// $ANDROID_BUILD_TOP/build/tools/releasetools/ota_metadata.proto. Keep in sync.
+type ApexMetadata struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	ApexInfo []*ApexInfo `protobuf:"bytes,1,rep,name=apex_info,json=apexInfo" json:"apex_info,omitempty"`
+}
+
+func (x *ApexMetadata) Reset() {
+	*x = ApexMetadata{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_update_metadata_proto_msgTypes[10]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ApexMetadata) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ApexMetadata) ProtoMessage() {}
+
+func (x *ApexMetadata) ProtoReflect() protoreflect.Message {
+	mi := &file_update_metadata_proto_msgTypes[10]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ApexMetadata.ProtoReflect.Descriptor instead.
+func (*ApexMetadata) Descriptor() ([]byte, []int) {
+	return file_update_metadata_proto_rawDescGZIP(), []int{10}
+}
+
+func (x *ApexMetadata) GetApexInfo() []*ApexInfo {
+	if x != nil {
+		return x.ApexInfo
+	}
+	return nil
+}
+
 type DeltaArchiveManifest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// Only present in major version = 1. List of install operations for the
-	// kernel and rootfs partitions. For major version = 2 see the |partitions|
-	// field.
-	//
-	// Deprecated: Marked as deprecated in update_metadata.proto.
-	InstallOperations []*InstallOperation `protobuf:"bytes,1,rep,name=install_operations,json=installOperations" json:"install_operations,omitempty"`
-	// Deprecated: Marked as deprecated in update_metadata.proto.
-	KernelInstallOperations []*InstallOperation `protobuf:"bytes,2,rep,name=kernel_install_operations,json=kernelInstallOperations" json:"kernel_install_operations,omitempty"`
 	// (At time of writing) usually 4096
 	BlockSize *uint32 `protobuf:"varint,3,opt,name=block_size,json=blockSize,def=4096" json:"block_size,omitempty"`
 	// If signatures are present, the offset into the blobs, generally
@@ -1108,20 +1268,6 @@ type DeltaArchiveManifest struct {
 	// file.
 	SignaturesOffset *uint64 `protobuf:"varint,4,opt,name=signatures_offset,json=signaturesOffset" json:"signatures_offset,omitempty"`
 	SignaturesSize   *uint64 `protobuf:"varint,5,opt,name=signatures_size,json=signaturesSize" json:"signatures_size,omitempty"`
-	// Only present in major version = 1. Partition metadata used to validate the
-	// update. For major version = 2 see the |partitions| field.
-	//
-	// Deprecated: Marked as deprecated in update_metadata.proto.
-	OldKernelInfo *PartitionInfo `protobuf:"bytes,6,opt,name=old_kernel_info,json=oldKernelInfo" json:"old_kernel_info,omitempty"`
-	// Deprecated: Marked as deprecated in update_metadata.proto.
-	NewKernelInfo *PartitionInfo `protobuf:"bytes,7,opt,name=new_kernel_info,json=newKernelInfo" json:"new_kernel_info,omitempty"`
-	// Deprecated: Marked as deprecated in update_metadata.proto.
-	OldRootfsInfo *PartitionInfo `protobuf:"bytes,8,opt,name=old_rootfs_info,json=oldRootfsInfo" json:"old_rootfs_info,omitempty"`
-	// Deprecated: Marked as deprecated in update_metadata.proto.
-	NewRootfsInfo *PartitionInfo `protobuf:"bytes,9,opt,name=new_rootfs_info,json=newRootfsInfo" json:"new_rootfs_info,omitempty"`
-	// old_image_info will only be present for delta images.
-	OldImageInfo *ImageInfo `protobuf:"bytes,10,opt,name=old_image_info,json=oldImageInfo" json:"old_image_info,omitempty"`
-	NewImageInfo *ImageInfo `protobuf:"bytes,11,opt,name=new_image_info,json=newImageInfo" json:"new_image_info,omitempty"`
 	// The minor version, also referred as "delta version", of the payload.
 	// Minor version 0 is full payload, everything else is delta payload.
 	MinorVersion *uint32 `protobuf:"varint,12,opt,name=minor_version,json=minorVersion,def=0" json:"minor_version,omitempty"`
@@ -1139,6 +1285,12 @@ type DeltaArchiveManifest struct {
 	DynamicPartitionMetadata *DynamicPartitionMetadata `protobuf:"bytes,15,opt,name=dynamic_partition_metadata,json=dynamicPartitionMetadata" json:"dynamic_partition_metadata,omitempty"`
 	// If the payload only updates a subset of partitions on the device.
 	PartialUpdate *bool `protobuf:"varint,16,opt,name=partial_update,json=partialUpdate" json:"partial_update,omitempty"`
+	// Information on compressed APEX to figure out how much space is required for
+	// their decompression
+	ApexInfo []*ApexInfo `protobuf:"bytes,17,rep,name=apex_info,json=apexInfo" json:"apex_info,omitempty"`
+	// Security patch level of the device, usually in the format of
+	// yyyy-mm-dd
+	SecurityPatchLevel *string `protobuf:"bytes,18,opt,name=security_patch_level,json=securityPatchLevel" json:"security_patch_level,omitempty"`
 }
 
 // Default values for DeltaArchiveManifest fields.
@@ -1150,7 +1302,7 @@ const (
 func (x *DeltaArchiveManifest) Reset() {
 	*x = DeltaArchiveManifest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_update_metadata_proto_msgTypes[9]
+		mi := &file_update_metadata_proto_msgTypes[11]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1163,7 +1315,7 @@ func (x *DeltaArchiveManifest) String() string {
 func (*DeltaArchiveManifest) ProtoMessage() {}
 
 func (x *DeltaArchiveManifest) ProtoReflect() protoreflect.Message {
-	mi := &file_update_metadata_proto_msgTypes[9]
+	mi := &file_update_metadata_proto_msgTypes[11]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1176,23 +1328,7 @@ func (x *DeltaArchiveManifest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use DeltaArchiveManifest.ProtoReflect.Descriptor instead.
 func (*DeltaArchiveManifest) Descriptor() ([]byte, []int) {
-	return file_update_metadata_proto_rawDescGZIP(), []int{9}
-}
-
-// Deprecated: Marked as deprecated in update_metadata.proto.
-func (x *DeltaArchiveManifest) GetInstallOperations() []*InstallOperation {
-	if x != nil {
-		return x.InstallOperations
-	}
-	return nil
-}
-
-// Deprecated: Marked as deprecated in update_metadata.proto.
-func (x *DeltaArchiveManifest) GetKernelInstallOperations() []*InstallOperation {
-	if x != nil {
-		return x.KernelInstallOperations
-	}
-	return nil
+	return file_update_metadata_proto_rawDescGZIP(), []int{11}
 }
 
 func (x *DeltaArchiveManifest) GetBlockSize() uint32 {
@@ -1216,52 +1352,6 @@ func (x *DeltaArchiveManifest) GetSignaturesSize() uint64 {
 	return 0
 }
 
-// Deprecated: Marked as deprecated in update_metadata.proto.
-func (x *DeltaArchiveManifest) GetOldKernelInfo() *PartitionInfo {
-	if x != nil {
-		return x.OldKernelInfo
-	}
-	return nil
-}
-
-// Deprecated: Marked as deprecated in update_metadata.proto.
-func (x *DeltaArchiveManifest) GetNewKernelInfo() *PartitionInfo {
-	if x != nil {
-		return x.NewKernelInfo
-	}
-	return nil
-}
-
-// Deprecated: Marked as deprecated in update_metadata.proto.
-func (x *DeltaArchiveManifest) GetOldRootfsInfo() *PartitionInfo {
-	if x != nil {
-		return x.OldRootfsInfo
-	}
-	return nil
-}
-
-// Deprecated: Marked as deprecated in update_metadata.proto.
-func (x *DeltaArchiveManifest) GetNewRootfsInfo() *PartitionInfo {
-	if x != nil {
-		return x.NewRootfsInfo
-	}
-	return nil
-}
-
-func (x *DeltaArchiveManifest) GetOldImageInfo() *ImageInfo {
-	if x != nil {
-		return x.OldImageInfo
-	}
-	return nil
-}
-
-func (x *DeltaArchiveManifest) GetNewImageInfo() *ImageInfo {
-	if x != nil {
-		return x.NewImageInfo
-	}
-	return nil
-}
-
 func (x *DeltaArchiveManifest) GetMinorVersion() uint32 {
 	if x != nil && x.MinorVersion != nil {
 		return *x.MinorVersion
@@ -1297,6 +1387,20 @@ func (x *DeltaArchiveManifest) GetPartialUpdate() bool {
 	return false
 }
 
+func (x *DeltaArchiveManifest) GetApexInfo() []*ApexInfo {
+	if x != nil {
+		return x.ApexInfo
+	}
+	return nil
+}
+
+func (x *DeltaArchiveManifest) GetSecurityPatchLevel() string {
+	if x != nil && x.SecurityPatchLevel != nil {
+		return *x.SecurityPatchLevel
+	}
+	return ""
+}
+
 type Signatures_Signature struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1318,7 +1422,7 @@ type Signatures_Signature struct {
 func (x *Signatures_Signature) Reset() {
 	*x = Signatures_Signature{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_update_metadata_proto_msgTypes[10]
+		mi := &file_update_metadata_proto_msgTypes[12]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1331,7 +1435,7 @@ func (x *Signatures_Signature) String() string {
 func (*Signatures_Signature) ProtoMessage() {}
 
 func (x *Signatures_Signature) ProtoReflect() protoreflect.Message {
-	mi := &file_update_metadata_proto_msgTypes[10]
+	mi := &file_update_metadata_proto_msgTypes[12]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1396,226 +1500,232 @@ var file_update_metadata_proto_rawDesc = []byte{
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+	0x04, 0x5a, 0x02, 0x2e, 0x2f,
 }
 
 var (
@@ -1631,55 +1741,52 @@ func file_update_metadata_proto_rawDescGZIP() []byte {
 }
 
 var file_update_metadata_proto_enumTypes = make([]protoimpl.EnumInfo, 2)
-var file_update_metadata_proto_msgTypes = make([]protoimpl.MessageInfo, 11)
-var file_update_metadata_proto_goTypes = []any{
+var file_update_metadata_proto_msgTypes = make([]protoimpl.MessageInfo, 13)
+var file_update_metadata_proto_goTypes = []interface{}{
 	(InstallOperation_Type)(0),       // 0: chromeos_update_engine.InstallOperation.Type
 	(CowMergeOperation_Type)(0),      // 1: chromeos_update_engine.CowMergeOperation.Type
 	(*Extent)(nil),                   // 2: chromeos_update_engine.Extent
 	(*Signatures)(nil),               // 3: chromeos_update_engine.Signatures
 	(*PartitionInfo)(nil),            // 4: chromeos_update_engine.PartitionInfo
-	(*ImageInfo)(nil),                // 5: chromeos_update_engine.ImageInfo
-	(*InstallOperation)(nil),         // 6: chromeos_update_engine.InstallOperation
-	(*CowMergeOperation)(nil),        // 7: chromeos_update_engine.CowMergeOperation
-	(*PartitionUpdate)(nil),          // 8: chromeos_update_engine.PartitionUpdate
-	(*DynamicPartitionGroup)(nil),    // 9: chromeos_update_engine.DynamicPartitionGroup
+	(*InstallOperation)(nil),         // 5: chromeos_update_engine.InstallOperation
+	(*CowMergeOperation)(nil),        // 6: chromeos_update_engine.CowMergeOperation
+	(*PartitionUpdate)(nil),          // 7: chromeos_update_engine.PartitionUpdate
+	(*DynamicPartitionGroup)(nil),    // 8: chromeos_update_engine.DynamicPartitionGroup
+	(*VABCFeatureSet)(nil),           // 9: chromeos_update_engine.VABCFeatureSet
 	(*DynamicPartitionMetadata)(nil), // 10: chromeos_update_engine.DynamicPartitionMetadata
-	(*DeltaArchiveManifest)(nil),     // 11: chromeos_update_engine.DeltaArchiveManifest
-	(*Signatures_Signature)(nil),     // 12: chromeos_update_engine.Signatures.Signature
+	(*ApexInfo)(nil),                 // 11: chromeos_update_engine.ApexInfo
+	(*ApexMetadata)(nil),             // 12: chromeos_update_engine.ApexMetadata
+	(*DeltaArchiveManifest)(nil),     // 13: chromeos_update_engine.DeltaArchiveManifest
+	(*Signatures_Signature)(nil),     // 14: chromeos_update_engine.Signatures.Signature
 }
 var file_update_metadata_proto_depIdxs = []int32{
-	12, // 0: chromeos_update_engine.Signatures.signatures:type_name -> chromeos_update_engine.Signatures.Signature
+	14, // 0: chromeos_update_engine.Signatures.signatures:type_name -> chromeos_update_engine.Signatures.Signature
 	0,  // 1: chromeos_update_engine.InstallOperation.type:type_name -> chromeos_update_engine.InstallOperation.Type
 	2,  // 2: chromeos_update_engine.InstallOperation.src_extents:type_name -> chromeos_update_engine.Extent
 	2,  // 3: chromeos_update_engine.InstallOperation.dst_extents:type_name -> chromeos_update_engine.Extent
 	1,  // 4: chromeos_update_engine.CowMergeOperation.type:type_name -> chromeos_update_engine.CowMergeOperation.Type
 	2,  // 5: chromeos_update_engine.CowMergeOperation.src_extent:type_name -> chromeos_update_engine.Extent
 	2,  // 6: chromeos_update_engine.CowMergeOperation.dst_extent:type_name -> chromeos_update_engine.Extent
-	12, // 7: chromeos_update_engine.PartitionUpdate.new_partition_signature:type_name -> chromeos_update_engine.Signatures.Signature
+	14, // 7: chromeos_update_engine.PartitionUpdate.new_partition_signature:type_name -> chromeos_update_engine.Signatures.Signature
 	4,  // 8: chromeos_update_engine.PartitionUpdate.old_partition_info:type_name -> chromeos_update_engine.PartitionInfo
 	4,  // 9: chromeos_update_engine.PartitionUpdate.new_partition_info:type_name -> chromeos_update_engine.PartitionInfo
-	6,  // 10: chromeos_update_engine.PartitionUpdate.operations:type_name -> chromeos_update_engine.InstallOperation
+	5,  // 10: chromeos_update_engine.PartitionUpdate.operations:type_name -> chromeos_update_engine.InstallOperation
 	2,  // 11: chromeos_update_engine.PartitionUpdate.hash_tree_data_extent:type_name -> chromeos_update_engine.Extent
 	2,  // 12: chromeos_update_engine.PartitionUpdate.hash_tree_extent:type_name -> chromeos_update_engine.Extent
 	2,  // 13: chromeos_update_engine.PartitionUpdate.fec_data_extent:type_name -> chromeos_update_engine.Extent
 	2,  // 14: chromeos_update_engine.PartitionUpdate.fec_extent:type_name -> chromeos_update_engine.Extent
-	7,  // 15: chromeos_update_engine.PartitionUpdate.merge_operations:type_name -> chromeos_update_engine.CowMergeOperation
-	9,  // 16: chromeos_update_engine.DynamicPartitionMetadata.groups:type_name -> chromeos_update_engine.DynamicPartitionGroup
-	6,  // 17: chromeos_update_engine.DeltaArchiveManifest.install_operations:type_name -> chromeos_update_engine.InstallOperation
-	6,  // 18: chromeos_update_engine.DeltaArchiveManifest.kernel_install_operations:type_name -> chromeos_update_engine.InstallOperation
-	4,  // 19: chromeos_update_engine.DeltaArchiveManifest.old_kernel_info:type_name -> chromeos_update_engine.PartitionInfo
-	4,  // 20: chromeos_update_engine.DeltaArchiveManifest.new_kernel_info:type_name -> chromeos_update_engine.PartitionInfo
-	4,  // 21: chromeos_update_engine.DeltaArchiveManifest.old_rootfs_info:type_name -> chromeos_update_engine.PartitionInfo
-	4,  // 22: chromeos_update_engine.DeltaArchiveManifest.new_rootfs_info:type_name -> chromeos_update_engine.PartitionInfo
-	5,  // 23: chromeos_update_engine.DeltaArchiveManifest.old_image_info:type_name -> chromeos_update_engine.ImageInfo
-	5,  // 24: chromeos_update_engine.DeltaArchiveManifest.new_image_info:type_name -> chromeos_update_engine.ImageInfo
-	8,  // 25: chromeos_update_engine.DeltaArchiveManifest.partitions:type_name -> chromeos_update_engine.PartitionUpdate
-	10, // 26: chromeos_update_engine.DeltaArchiveManifest.dynamic_partition_metadata:type_name -> chromeos_update_engine.DynamicPartitionMetadata
-	27, // [27:27] is the sub-list for method output_type
-	27, // [27:27] is the sub-list for method input_type
-	27, // [27:27] is the sub-list for extension type_name
-	27, // [27:27] is the sub-list for extension extendee
-	0,  // [0:27] is the sub-list for field type_name
+	6,  // 15: chromeos_update_engine.PartitionUpdate.merge_operations:type_name -> chromeos_update_engine.CowMergeOperation
+	8,  // 16: chromeos_update_engine.DynamicPartitionMetadata.groups:type_name -> chromeos_update_engine.DynamicPartitionGroup
+	9,  // 17: chromeos_update_engine.DynamicPartitionMetadata.vabc_feature_set:type_name -> chromeos_update_engine.VABCFeatureSet
+	11, // 18: chromeos_update_engine.ApexMetadata.apex_info:type_name -> chromeos_update_engine.ApexInfo
+	7,  // 19: chromeos_update_engine.DeltaArchiveManifest.partitions:type_name -> chromeos_update_engine.PartitionUpdate
+	10, // 20: chromeos_update_engine.DeltaArchiveManifest.dynamic_partition_metadata:type_name -> chromeos_update_engine.DynamicPartitionMetadata
+	11, // 21: chromeos_update_engine.DeltaArchiveManifest.apex_info:type_name -> chromeos_update_engine.ApexInfo
+	22, // [22:22] is the sub-list for method output_type
+	22, // [22:22] is the sub-list for method input_type
+	22, // [22:22] is the sub-list for extension type_name
+	22, // [22:22] is the sub-list for extension extendee
+	0,  // [0:22] is the sub-list for field type_name
 }
 
 func init() { file_update_metadata_proto_init() }
@@ -1688,7 +1795,7 @@ func file_update_metadata_proto_init() {
 		return
 	}
 	if !protoimpl.UnsafeEnabled {
-		file_update_metadata_proto_msgTypes[0].Exporter = func(v any, i int) any {
+		file_update_metadata_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*Extent); i {
 			case 0:
 				return &v.state
@@ -1700,7 +1807,7 @@ func file_update_metadata_proto_init() {
 				return nil
 			}
 		}
-		file_update_metadata_proto_msgTypes[1].Exporter = func(v any, i int) any {
+		file_update_metadata_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*Signatures); i {
 			case 0:
 				return &v.state
@@ -1712,7 +1819,7 @@ func file_update_metadata_proto_init() {
 				return nil
 			}
 		}
-		file_update_metadata_proto_msgTypes[2].Exporter = func(v any, i int) any {
+		file_update_metadata_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*PartitionInfo); i {
 			case 0:
 				return &v.state
@@ -1724,8 +1831,8 @@ func file_update_metadata_proto_init() {
 				return nil
 			}
 		}
-		file_update_metadata_proto_msgTypes[3].Exporter = func(v any, i int) any {
-			switch v := v.(*ImageInfo); i {
+		file_update_metadata_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*InstallOperation); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1736,8 +1843,8 @@ func file_update_metadata_proto_init() {
 				return nil
 			}
 		}
-		file_update_metadata_proto_msgTypes[4].Exporter = func(v any, i int) any {
-			switch v := v.(*InstallOperation); i {
+		file_update_metadata_proto_msgTypes[4].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*CowMergeOperation); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1748,8 +1855,8 @@ func file_update_metadata_proto_init() {
 				return nil
 			}
 		}
-		file_update_metadata_proto_msgTypes[5].Exporter = func(v any, i int) any {
-			switch v := v.(*CowMergeOperation); i {
+		file_update_metadata_proto_msgTypes[5].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*PartitionUpdate); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1760,8 +1867,8 @@ func file_update_metadata_proto_init() {
 				return nil
 			}
 		}
-		file_update_metadata_proto_msgTypes[6].Exporter = func(v any, i int) any {
-			switch v := v.(*PartitionUpdate); i {
+		file_update_metadata_proto_msgTypes[6].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*DynamicPartitionGroup); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1772,8 +1879,8 @@ func file_update_metadata_proto_init() {
 				return nil
 			}
 		}
-		file_update_metadata_proto_msgTypes[7].Exporter = func(v any, i int) any {
-			switch v := v.(*DynamicPartitionGroup); i {
+		file_update_metadata_proto_msgTypes[7].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*VABCFeatureSet); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1784,7 +1891,7 @@ func file_update_metadata_proto_init() {
 				return nil
 			}
 		}
-		file_update_metadata_proto_msgTypes[8].Exporter = func(v any, i int) any {
+		file_update_metadata_proto_msgTypes[8].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*DynamicPartitionMetadata); i {
 			case 0:
 				return &v.state
@@ -1796,7 +1903,31 @@ func file_update_metadata_proto_init() {
 				return nil
 			}
 		}
-		file_update_metadata_proto_msgTypes[9].Exporter = func(v any, i int) any {
+		file_update_metadata_proto_msgTypes[9].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ApexInfo); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_update_metadata_proto_msgTypes[10].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ApexMetadata); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_update_metadata_proto_msgTypes[11].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*DeltaArchiveManifest); i {
 			case 0:
 				return &v.state
@@ -1808,7 +1939,7 @@ func file_update_metadata_proto_init() {
 				return nil
 			}
 		}
-		file_update_metadata_proto_msgTypes[10].Exporter = func(v any, i int) any {
+		file_update_metadata_proto_msgTypes[12].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*Signatures_Signature); i {
 			case 0:
 				return &v.state
@@ -1827,7 +1958,7 @@ func file_update_metadata_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_update_metadata_proto_rawDesc,
 			NumEnums:      2,
-			NumMessages:   11,
+			NumMessages:   13,
 			NumExtensions: 0,
 			NumServices:   0,
 		},
diff --git a/go.mod b/go.mod
index ed5cd1f..65dfe6d 100644
--- a/go.mod
+++ b/go.mod
@@ -13,5 +13,6 @@ require (
 	github.com/VividCortex/ewma v1.1.1 // indirect
 	github.com/acarl005/stripansi v0.0.0-20180116102854-5a71ef0e047d // indirect
 	github.com/mattn/go-runewidth v0.0.9 // indirect
+	github.com/valyala/gozstd v1.21.1 // indirect
 	golang.org/x/sys v0.22.0 // indirect
 )
diff --git a/go.sum b/go.sum
index 8827ffd..f6d7ff0 100644
--- a/go.sum
+++ b/go.sum
@@ -9,6 +9,8 @@ github.com/mattn/go-runewidth v0.0.9 h1:Lm995f3rfxdpd6TSmuVCHVb/QhupuXlYr8sCI/Qd
 github.com/mattn/go-runewidth v0.0.9/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
 github.com/spencercw/go-xz v0.0.0-20181128201811-c82a2123b492 h1:8J9q7E8tGpVB84cBsMr+X160ECRqwYhkZ6KeaY9kN1I=
 github.com/spencercw/go-xz v0.0.0-20181128201811-c82a2123b492/go.mod h1:EvRrgz1GcjNV5yfN+ISxA4sxn255MimeGQ/ROJnQPtQ=
+github.com/valyala/gozstd v1.21.1 h1:TQFZVTk5zo7iJcX3o4XYBJujPdO31LFb4fVImwK873A=
+github.com/valyala/gozstd v1.21.1/go.mod h1:y5Ew47GLlP37EkTB+B4s7r6A5rdaeB7ftbl9zoYiIPQ=
 github.com/vbauerster/mpb/v5 v5.4.0 h1:n8JPunifvQvh6P1D1HAl2Ur9YcmKT1tpoUuiea5mlmg=
 github.com/vbauerster/mpb/v5 v5.4.0/go.mod h1:fi4wVo7BVQ22QcvFObm+VwliQXlV1eBT8JDaKXR4JGI=
 golang.org/x/sys v0.0.0-20201218084310-7d0127a74742/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
diff --git a/payload.go b/payload.go
index 261d634..a558ec7 100644
--- a/payload.go
+++ b/payload.go
@@ -12,6 +12,7 @@ import (
 	"os"
 	"sort"
 	"sync"
+	"github.com/valyala/gozstd"
 
 	humanize "github.com/dustin/go-humanize"
 	xz "github.com/spencercw/go-xz"
@@ -290,6 +291,17 @@ func (p *Payload) Extract(partition *chromeos_update_engine.PartitionUpdate, out
 			}
 			break
 
+		case chromeos_update_engine.InstallOperation_ZSTD:
+			reader := gozstd.NewReader(teeReader)
+			n, err := io.Copy(out, reader)
+			if err != nil {
+				return err
+			}
+			if n != expectedUncompressedBlockSize {
+				return fmt.Errorf("Verify failed (Unexpected bytes written): %s (%d != %d)", name, n, expectedUncompressedBlockSize)
+			}
+			break
+
 		case chromeos_update_engine.InstallOperation_ZERO:
 			reader := bytes.NewReader(make([]byte, expectedUncompressedBlockSize))
 			n, err := io.Copy(out, reader)
diff --git a/update_metadata.proto b/update_metadata.proto
index a2eccb5..e150c55 100644
--- a/update_metadata.proto
+++ b/update_metadata.proto
@@ -13,6 +13,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 //
+
 // Update file format: An update file contains all the operations needed
 // to update a system to a specific version. It can be a full payload which
 // can update from any version, or a delta payload which can only update
@@ -48,11 +49,14 @@
 //   char payload_signatures_message[payload_signatures_message_size];
 //
 // };
+
 // The DeltaArchiveManifest protobuf is an ordered list of InstallOperation
 // objects. These objects are stored in a linear array in the
 // DeltaArchiveManifest. Each operation is applied in order by the client.
+
 // The DeltaArchiveManifest also contains the initial and final
 // checksums for the device.
+
 // The client will perform each InstallOperation in order, beginning even
 // before the entire delta file is downloaded (but after at least the
 // protobuf is downloaded). The types of operations are explained:
@@ -84,9 +88,13 @@
 //
 // The operations allowed in the payload (supported by the client) depend on the
 // major and minor version. See InstallOperation.Type below for details.
+
 syntax = "proto2";
+
 package chromeos_update_engine;
-option optimize_for = LITE_RUNTIME;
+
+option go_package = "./";
+
 // Data is packed into blocks on disk, always starting from the beginning
 // of the block. If a file's data is too large for one block, it overflows
 // into another block, which may or may not be the following block on the
@@ -99,10 +107,12 @@ option optimize_for = LITE_RUNTIME;
 // run-length encoding).
 // A sentinel value (kuint64max) as the start block denotes a sparse-hole
 // in a file whose block-length is specified by num_blocks.
+
 message Extent {
   optional uint64 start_block = 1;
   optional uint64 num_blocks = 2;
 }
+
 // Signatures: Updates may be signed by the OS vendor. The client verifies
 // an update's signature by hashing the entire download. The section of the
 // download that contains the signature is at the end of the file, so when
@@ -114,10 +124,12 @@ message Extent {
 // selects a Signature message and uses that, along with a known public key,
 // to verify the download. The public key is expected to be part of the
 // client.
+
 message Signatures {
   message Signature {
     optional uint32 version = 1 [deprecated = true];
     optional bytes data = 2;
+
     // The DER encoded signature size of EC keys is nondeterministic for
     // different input of sha256 hash. However, we need the size of the
     // serialized signatures protobuf string to be fixed before signing;
@@ -129,47 +141,46 @@ message Signatures {
   }
   repeated Signature signatures = 1;
 }
+
 message PartitionInfo {
   optional uint64 size = 1;
   optional bytes hash = 2;
 }
-// Describe an image we are based on in a human friendly way.
-// Examples:
-//   dev-channel, x86-alex, 1.2.3, mp-v3
-//   nplusone-channel, x86-alex, 1.2.4, mp-v3, dev-channel, 1.2.3
-//
-// All fields will be set, if this message is present.
-message ImageInfo {
-  optional string board = 1;
-  optional string key = 2;
-  optional string channel = 3;
-  optional string version = 4;
-  // If these values aren't present, they should be assumed to match
-  // the equivalent value above. They are normally only different for
-  // special image types such as nplusone images.
-  optional string build_channel = 5;
-  optional string build_version = 6;
-}
+
 message InstallOperation {
   enum Type {
     REPLACE = 0;     // Replace destination extents w/ attached data.
     REPLACE_BZ = 1;  // Replace destination extents w/ attached bzipped data.
     MOVE = 2 [deprecated = true];    // Move source extents to target extents.
     BSDIFF = 3 [deprecated = true];  // The data is a bsdiff binary diff.
+
     // On minor version 2 or newer, these operations are supported:
-    SOURCE_COPY = 4; // Copy from source to target partition
-    SOURCE_BSDIFF = 5; // Like BSDIFF, but read from source partition
+    SOURCE_COPY = 4;    // Copy from source to target partition
+    SOURCE_BSDIFF = 5;  // Like BSDIFF, but read from source partition
+
     // On minor version 3 or newer and on major version 2 or newer, these
     // operations are supported:
-    REPLACE_XZ = 8; // Replace destination extents w/ attached xz data.
+    REPLACE_XZ = 8;  // Replace destination extents w/ attached xz data.
+
     // On minor version 4 or newer, these operations are supported:
-    ZERO = 6;  // Write zeros in the destination.
+    ZERO = 6;     // Write zeros in the destination.
     DISCARD = 7;  // Discard the destination blocks, reading as undefined.
     BROTLI_BSDIFF = 10;  // Like SOURCE_BSDIFF, but compressed with brotli.
+
     // On minor version 5 or newer, these operations are supported:
     PUFFDIFF = 9;  // The data is in puffdiff format.
+
+    // On minor version 8 or newer, these operations are supported:
+    ZUCCHINI = 11;
+
+    // On minor version 9 or newer, these operations are supported:
+    LZ4DIFF_BSDIFF = 12;
+    LZ4DIFF_PUFFDIFF = 13;
+    
+    ZSTD = 14;
   }
   required Type type = 1;
+
   // Only minor version 6 or newer support 64 bits |data_offset| and
   // |data_length|, older client will read them as uint32.
   // The offset into the delta file (after the protobuf)
@@ -177,6 +188,7 @@ message InstallOperation {
   optional uint64 data_offset = 2;
   // The length of the data in the delta file
   optional uint64 data_length = 3;
+
   // Ordered list of extents that are read from (if any) and written to.
   repeated Extent src_extents = 4;
   // Byte length of src, equal to the number of blocks in src_extents *
@@ -184,22 +196,26 @@ message InstallOperation {
   // pass that external program the number of bytes to read from the blocks we
   // pass it.  This is not used in any other operation.
   optional uint64 src_length = 5;
+
   repeated Extent dst_extents = 6;
   // Byte length of dst, equal to the number of blocks in dst_extents *
   // block_size. Used for BSDIFF and SOURCE_BSDIFF, but not in any other
   // operation.
   optional uint64 dst_length = 7;
+
   // Optional SHA 256 hash of the blob associated with this operation.
   // This is used as a primary validation for http-based downloads and
   // as a defense-in-depth validation for https-based downloads. If
   // the operation doesn't refer to any blob, this field will have
   // zero bytes.
   optional bytes data_sha256_hash = 8;
+
   // Indicates the SHA 256 hash of the source data referenced in src_extents at
   // the time of applying the operation. If present, the update_engine daemon
   // MUST read and verify the source data before applying the operation.
   optional bytes src_sha256_hash = 9;
 }
+
 // Hints to VAB snapshot to skip writing some blocks if these blocks are
 // identical to the ones on the source image. The src & dst extents for each
 // CowMergeOperation should be contiguous, and they're a subset of an OTA
@@ -208,78 +224,125 @@ message InstallOperation {
 // read after write, similar to the inplace update schema.
 message CowMergeOperation {
   enum Type {
-    COW_COPY = 0;  // identical blocks
+    COW_COPY = 0;     // identical blocks
+    COW_XOR = 1;      // used when src/dst blocks are highly similar
+    COW_REPLACE = 2;  // Raw replace operation
   }
   optional Type type = 1;
+
   optional Extent src_extent = 2;
   optional Extent dst_extent = 3;
+  // For COW_XOR, source location might be unaligned, so this field is in range
+  // [0, block_size), representing how much should the src_extent shift toward
+  // larger block number. If this field is non-zero, then src_extent will
+  // include 1 extra block in the end, as the merge op actually references the
+  // first |src_offset| bytes of that extra block. For example, if |dst_extent|
+  // is [10, 15], |src_offset| is 500, then src_extent might look like [25, 31].
+  // Note that |src_extent| contains 1 extra block than the |dst_extent|.
+  optional uint32 src_offset = 4;
 }
+
 // Describes the update to apply to a single partition.
 message PartitionUpdate {
   // A platform-specific name to identify the partition set being updated. For
   // example, in Chrome OS this could be "ROOT" or "KERNEL".
   required string partition_name = 1;
+
   // Whether this partition carries a filesystem with post-install program that
   // must be run to finalize the update process. See also |postinstall_path| and
   // |filesystem_type|.
   optional bool run_postinstall = 2;
+
   // The path of the executable program to run during the post-install step,
   // relative to the root of this filesystem. If not set, the default "postinst"
   // will be used. This setting is only used when |run_postinstall| is set and
   // true.
   optional string postinstall_path = 3;
+
   // The filesystem type as passed to the mount(2) syscall when mounting the new
   // filesystem to run the post-install program. If not set, a fixed list of
   // filesystems will be attempted. This setting is only used if
   // |run_postinstall| is set and true.
   optional string filesystem_type = 4;
+
   // If present, a list of signatures of the new_partition_info.hash signed with
   // different keys. If the update_engine daemon requires vendor-signed images
   // and has its public key installed, one of the signatures should be valid
   // for /postinstall to run.
   repeated Signatures.Signature new_partition_signature = 5;
+
   optional PartitionInfo old_partition_info = 6;
   optional PartitionInfo new_partition_info = 7;
+
   // The list of operations to be performed to apply this PartitionUpdate. The
   // associated operation blobs (in operations[i].data_offset, data_length)
   // should be stored contiguously and in the same order.
   repeated InstallOperation operations = 8;
+
   // Whether a failure in the postinstall step for this partition should be
   // ignored.
   optional bool postinstall_optional = 9;
+
   // On minor version 6 or newer, these fields are supported:
+
   // The extent for data covered by verity hash tree.
   optional Extent hash_tree_data_extent = 10;
+
   // The extent to store verity hash tree.
   optional Extent hash_tree_extent = 11;
+
   // The hash algorithm used in verity hash tree.
   optional string hash_tree_algorithm = 12;
+
   // The salt used for verity hash tree.
   optional bytes hash_tree_salt = 13;
+
   // The extent for data covered by FEC.
   optional Extent fec_data_extent = 14;
+
   // The extent to store FEC.
   optional Extent fec_extent = 15;
+
   // The number of FEC roots.
   optional uint32 fec_roots = 16 [default = 2];
+
   // Per-partition version used for downgrade detection, added
   // as an effort to support partial updates. For most partitions,
   // this is the build timestamp.
   optional string version = 17;
+
   // A sorted list of CowMergeOperation. When writing cow, we can choose to
   // skip writing the raw bytes for these extents. During snapshot merge, the
   // bytes will read from the source partitions instead.
   repeated CowMergeOperation merge_operations = 18;
+
+  // Estimated size for COW image. This is used by libsnapshot
+  // as a hint. If set to 0, libsnapshot should use alternative
+  // methods for estimating size.
+  optional uint64 estimate_cow_size = 19;
+
+  // Information about the cow used by Cow Writer to specify
+  // number of cow operations to be written
+  optional uint64 estimate_op_count_max = 20;
 }
+
 message DynamicPartitionGroup {
   // Name of the group.
   required string name = 1;
+
   // Maximum size of the group. The sum of sizes of all partitions in the group
   // must not exceed the maximum size of the group.
   optional uint64 size = 2;
+
   // A list of partitions that belong to the group.
   repeated string partition_names = 3;
 }
+
+message VABCFeatureSet {
+  optional bool threaded = 1;
+  optional bool batch_writes = 2;
+}
+
 // Metadata related to all dynamic partitions.
 message DynamicPartitionMetadata {
   // All updatable groups present in |partitions| of this DeltaArchiveManifest.
@@ -289,20 +352,60 @@ message DynamicPartitionMetadata {
   // - If an updatable group is in the manifest but not on the device, the group
   //   is added to the device.
   repeated DynamicPartitionGroup groups = 1;
+
   // Whether dynamic partitions have snapshots during the update. If this is
   // set to true, the update_engine daemon creates snapshots for all dynamic
   // partitions if possible. If this is unset, the update_engine daemon MUST
   // NOT create snapshots for dynamic partitions.
   optional bool snapshot_enabled = 2;
+
+  // If this is set to false, update_engine should not use VABC regardless. If
+  // this is set to true, update_engine may choose to use VABC if device
+  // supports it, but not guaranteed.
+  // VABC stands for Virtual AB Compression
+  optional bool vabc_enabled = 3;
+
+  // The compression algorithm used by VABC. Available ones are "gz", "brotli".
+  // See system/core/fs_mgr/libsnapshot/cow_writer.cpp for available options,
+  // as this parameter is ultimated forwarded to libsnapshot's CowWriter
+  optional string vabc_compression_param = 4;
+
+  // COW version used by VABC. The represents the major version in the COW
+  // header
+  optional uint32 cow_version = 5;
+
+  // A collection of knobs to tune Virtual AB Compression
+  optional VABCFeatureSet vabc_feature_set = 6;
+
+  // Max bytes to be compressed at once during ota. Options: 4k, 8k, 16k, 32k,
+  // 64k, 128k
+  optional uint64 compression_factor = 7;
+}
+
+// Definition has been duplicated from
+// $ANDROID_BUILD_TOP/build/tools/releasetools/ota_metadata.proto. Keep in sync.
+message ApexInfo {
+  optional string package_name = 1;
+  optional int64 version = 2;
+  optional bool is_compressed = 3;
+  optional int64 decompressed_size = 4;
+}
+
+// Definition has been duplicated from
+// $ANDROID_BUILD_TOP/build/tools/releasetools/ota_metadata.proto. Keep in sync.
+message ApexMetadata {
+  repeated ApexInfo apex_info = 1;
 }
+
 message DeltaArchiveManifest {
   // Only present in major version = 1. List of install operations for the
   // kernel and rootfs partitions. For major version = 2 see the |partitions|
   // field.
-  repeated InstallOperation install_operations = 1 [deprecated = true];
-  repeated InstallOperation kernel_install_operations = 2 [deprecated = true];
+  reserved 1, 2;
+
   // (At time of writing) usually 4096
   optional uint32 block_size = 3 [default = 4096];
+
   // If signatures are present, the offset into the blobs, generally
   // tacked onto the end of the file, and the length. We use an offset
   // rather than a bool to allow for more flexibility in future file formats.
@@ -310,18 +413,14 @@ message DeltaArchiveManifest {
   // file.
   optional uint64 signatures_offset = 4;
   optional uint64 signatures_size = 5;
-  // Only present in major version = 1. Partition metadata used to validate the
-  // update. For major version = 2 see the |partitions| field.
-  optional PartitionInfo old_kernel_info = 6 [deprecated = true];
-  optional PartitionInfo new_kernel_info = 7 [deprecated = true];
-  optional PartitionInfo old_rootfs_info = 8 [deprecated = true];
-  optional PartitionInfo new_rootfs_info = 9 [deprecated = true];
-  // old_image_info will only be present for delta images.
-  optional ImageInfo old_image_info = 10;
-  optional ImageInfo new_image_info = 11;
+
+  // Fields deprecated in major version 2.
+  reserved 6,7,8,9,10,11;
+
   // The minor version, also referred as "delta version", of the payload.
   // Minor version 0 is full payload, everything else is delta payload.
   optional uint32 minor_version = 12 [default = 0];
+
   // Only present in major version >= 2. List of partitions that will be
   // updated, in the order they will be updated. This field replaces the
   // |install_operations|, |kernel_install_operations| and the
@@ -329,11 +428,22 @@ message DeltaArchiveManifest {
   // array can have more than two partitions if needed, and they are identified
   // by the partition name.
   repeated PartitionUpdate partitions = 13;
+
   // The maximum timestamp of the OS allowed to apply this payload.
   // Can be used to prevent downgrading the OS.
   optional int64 max_timestamp = 14;
+
   // Metadata related to all dynamic partitions.
   optional DynamicPartitionMetadata dynamic_partition_metadata = 15;
+
   // If the payload only updates a subset of partitions on the device.
   optional bool partial_update = 16;
+
+  // Information on compressed APEX to figure out how much space is required for
+  // their decompression
+  repeated ApexInfo apex_info = 17;
+
+  // Security patch level of the device, usually in the format of
+  // yyyy-mm-dd
+  optional string security_patch_level = 18;
 }