diff --git a/build/checksums.txt b/build/checksums.txt
index e40445a6c4..bcbc102c4d 100644
--- a/build/checksums.txt
+++ b/build/checksums.txt
@@ -2,8 +2,8 @@
 
 # version:spec-tests v5.1.0
 # https://github.com/ethereum/execution-spec-tests/releases
-# https://github.com/ethereum/execution-spec-tests/releases/download/bal%40v2.0.0
-68b2f29a3e3a794b5a9a23692190847f177e0a7a24891ccc7d7ad267ca59e4e0 fixtures_bal.tar.gz
+# https://github.com/ethereum/execution-spec-tests/releases/download/bal%40v3.0.1
+57d0f109f0557ec33d6ecd6cbd77b55415a658aefe583c4035157e1021ae512a fixtures_bal.tar.gz
 
 # version:golang 1.25.1
 # https://go.dev/dl/
diff --git a/cmd/evm/blockrunner.go b/cmd/evm/blockrunner.go
index 0090cc12af..c6fac5396e 100644
--- a/cmd/evm/blockrunner.go
+++ b/cmd/evm/blockrunner.go
@@ -20,7 +20,6 @@ import (
 	"bufio"
 	"encoding/json"
 	"fmt"
-	"github.com/ethereum/go-ethereum/cmd/utils"
 	"maps"
 	"os"
 	"regexp"
@@ -118,7 +117,7 @@ func runBlockTest(ctx *cli.Context, fname string) ([]testResult, error) {
 		test := tests[name]
 		result := &testResult{Name: name, Pass: true}
 		var finalRoot *common.Hash
-		if err := test.Run(false, rawdb.PathScheme, ctx.Bool(WitnessCrossCheckFlag.Name), ctx.Bool(utils.ExperimentalBALFlag.Name), tracer, func(res error, chain *core.BlockChain) {
+		if err := test.Run(false, rawdb.PathScheme, ctx.Bool(WitnessCrossCheckFlag.Name), tracer, func(res error, chain *core.BlockChain) {
 			if ctx.Bool(DumpFlag.Name) {
 				if s, _ := chain.State(); s != nil {
 					result.State = dump(s)
diff --git a/consensus/misc/eip4844/eip4844.go b/consensus/misc/eip4844/eip4844.go
index 6b02b2e91c..6078d21059 100644
--- a/consensus/misc/eip4844/eip4844.go
+++ b/consensus/misc/eip4844/eip4844.go
@@ -69,12 +69,12 @@ func latestBlobConfig(cfg *params.ChainConfig, time uint64) *BlobConfig {
 		bc = s.BPO4
 	case cfg.IsBPO3(london, time) && s.BPO3 != nil:
 		bc = s.BPO3
+	case cfg.IsAmsterdam(london, time) && s.Amsterdam != nil:
+		bc = s.BPO2
 	case cfg.IsBPO2(london, time) && s.BPO2 != nil:
 		bc = s.BPO2
 	case cfg.IsBPO1(london, time) && s.BPO1 != nil:
 		bc = s.BPO1
-	case cfg.IsAmsterdam(london, time) && s.Amsterdam != nil:
-		bc = s.Amsterdam
 	case cfg.IsOsaka(london, time) && s.Osaka != nil:
 		bc = s.Osaka
 	case cfg.IsPrague(london, time) && s.Prague != nil:
diff --git a/core/block_validator.go b/core/block_validator.go
index 417657d854..7229473016 100644
--- a/core/block_validator.go
+++ b/core/block_validator.go
@@ -112,12 +112,16 @@ func (v *BlockValidator) ValidateBody(block *types.Block) error {
 
 	// block access lists must be present after the Amsterdam hard fork
 	if v.config.IsAmsterdam(block.Number(), block.Time()) {
-		if block.Body().AccessList == nil {
-			return fmt.Errorf("access list not present in block body")
-		} else if *block.Header().BlockAccessListHash != block.Body().AccessList.Hash() {
-			return fmt.Errorf("access list hash mismatch.  local: %x. remote: %x\n", block.Body().AccessList.Hash(), *block.Header().BlockAccessListHash)
-		} else if err := block.Body().AccessList.Validate(len(block.Transactions())); err != nil {
-			return fmt.Errorf("invalid block access list: %v", err)
+		if block.Header().BlockAccessListHash == nil {
+			// TODO: verify that this check isn't also done elsewhere
+			return fmt.Errorf("block access list hash not set in header")
+		}
+		if block.Body().AccessList != nil {
+			if *block.Header().BlockAccessListHash != block.Body().AccessList.Hash() {
+				return fmt.Errorf("access list hash mismatch.  local: %x. remote: %x\n", block.Body().AccessList.Hash(), *block.Header().BlockAccessListHash)
+			} else if err := block.Body().AccessList.Validate(len(block.Transactions())); err != nil {
+				return fmt.Errorf("invalid block access list: %v", err)
+			}
 		}
 	}
 
diff --git a/core/blockchain.go b/core/blockchain.go
index f09cdeaf22..5be55eef41 100644
--- a/core/blockchain.go
+++ b/core/blockchain.go
@@ -2211,7 +2211,15 @@ func (bc *BlockChain) ProcessBlock(parentRoot common.Hash, block *types.Block, s
 			bc.reportBadBlock(block, res, err)
 			return nil, err
 		}
-		if block.Body().AccessList != nil && block.Body().AccessList.Hash() != computedAccessListHash {
+		if block.Body().AccessList == nil {
+			// very ugly... deep copy the block body before setting the block access
+			// list on it to prevent mutating the block instance passed by the caller.
+			existingBody := block.Body()
+			block = block.WithBody(*existingBody)
+			existingBody = block.Body()
+			existingBody.AccessList = computedAccessList
+			block = block.WithBody(*existingBody)
+		} else if block.Body().AccessList.Hash() != computedAccessListHash {
 			err := fmt.Errorf("block access list hash mismatch (remote=%x computed=%x)", block.Body().AccessList.Hash(), computedAccessListHash)
 			bc.reportBadBlock(block, res, err)
 			return nil, err
diff --git a/params/config.go b/params/config.go
index 4d18310e7a..28c4847bf1 100644
--- a/params/config.go
+++ b/params/config.go
@@ -236,6 +236,8 @@ var (
 			Cancun: DefaultCancunBlobConfig,
 			Prague: DefaultPragueBlobConfig,
 			Osaka:  DefaultOsakaBlobConfig,
+			BPO1:   DefaultBPO1BlobConfig,
+			BPO2:   DefaultBPO2BlobConfig,
 		},
 	}
 
diff --git a/tests/init.go b/tests/init.go
index c5ac4fdb16..4c3268c41c 100644
--- a/tests/init.go
+++ b/tests/init.go
@@ -521,8 +521,8 @@ var Forks = map[string]*params.ChainConfig{
 			Cancun: params.DefaultCancunBlobConfig,
 			Prague: params.DefaultPragueBlobConfig,
 			Osaka:  params.DefaultOsakaBlobConfig,
-			//BPO1:   bpo1BlobConfig,
-			//BPO2:   bpo2BlobConfig,
+			BPO1:   bpo1BlobConfig,
+			BPO2:   bpo2BlobConfig,
 		},
 	},
 	"OsakaToBPO1AtTime15k": {