diff --git a/BUCK b/BUCK
index 78b7b158cd7e79..0e0de2f5f9274c 100644
--- a/BUCK
+++ b/BUCK
@@ -12,7 +12,6 @@ load(
     "//tools/build_defs/oss:rn_defs.bzl",
     "ANDROID",
     "APPLE",
-    "HERMES_BYTECODE_VERSION",
     "IOS",
     "RCT_IMAGE_DATA_DECODER_SOCKET",
     "RCT_IMAGE_URL_LOADER_SOCKET",
@@ -429,9 +428,7 @@ rn_apple_xplat_cxx_library(
         "linux",
         ["-D PIC_MODIFIER=@PLT"],
     )],
-    preprocessor_flags = get_objc_arc_preprocessor_flags() + get_preprocessor_flags_for_build_mode() + [
-        "-DHERMES_BYTECODE_VERSION={}".format(HERMES_BYTECODE_VERSION),
-    ] + rn_extra_build_flags(),
+    preprocessor_flags = get_objc_arc_preprocessor_flags() + get_preprocessor_flags_for_build_mode() + rn_extra_build_flags(),
     visibility = [
         "//fbobjc/Apps/Internal/SparkLabs/...",
         "//fbobjc/Apps/Internal/Venice/...",
diff --git a/packages/react-native/React/Base/RCTBundleURLProvider.mm b/packages/react-native/React/Base/RCTBundleURLProvider.mm
index 33a9ae8ae9c9a1..d8ec3bcfa1e92f 100644
--- a/packages/react-native/React/Base/RCTBundleURLProvider.mm
+++ b/packages/react-native/React/Base/RCTBundleURLProvider.mm
@@ -265,19 +265,13 @@ + (NSURL *)jsBundleURLForBundleRoot:(NSString *)bundleRoot
                           runModule:(BOOL)runModule
 {
   NSString *path = [NSString stringWithFormat:@"/%@.bundle", bundleRoot];
-#ifdef HERMES_BYTECODE_VERSION
-  NSString *runtimeBytecodeVersion = [NSString stringWithFormat:@"&runtimeBytecodeVersion=%u", HERMES_BYTECODE_VERSION];
-#else
-  NSString *runtimeBytecodeVersion = @"";
-#endif
 
   // When we support only iOS 8 and above, use queryItems for a better API.
-  NSString *query = [NSString stringWithFormat:@"platform=ios&dev=%@&minify=%@&modulesOnly=%@&runModule=%@%@",
+  NSString *query = [NSString stringWithFormat:@"platform=ios&dev=%@&minify=%@&modulesOnly=%@&runModule=%@",
                                                enableDev ? @"true" : @"false",
                                                enableMinification ? @"true" : @"false",
                                                modulesOnly ? @"true" : @"false",
-                                               runModule ? @"true" : @"false",
-                                               runtimeBytecodeVersion];
+                                               runModule ? @"true" : @"false"];
 
   NSString *bundleID = [[NSBundle mainBundle] objectForInfoDictionaryKey:(NSString *)kCFBundleIdentifierKey];
   if (bundleID) {
diff --git a/packages/react-native/React/Base/RCTJavaScriptLoader.h b/packages/react-native/React/Base/RCTJavaScriptLoader.h
index a8a95f726392f2..9893e6931660e0 100755
--- a/packages/react-native/React/Base/RCTJavaScriptLoader.h
+++ b/packages/react-native/React/Base/RCTJavaScriptLoader.h
@@ -11,8 +11,6 @@
 
 extern NSString *const RCTJavaScriptLoaderErrorDomain;
 
-extern const uint32_t RCT_BYTECODE_ALIGNMENT;
-
 NS_ENUM(NSInteger){
     RCTJavaScriptLoaderErrorNoScriptURL = 1,
     RCTJavaScriptLoaderErrorFailedOpeningFile = 2,
diff --git a/packages/react-native/React/Base/RCTJavaScriptLoader.mm b/packages/react-native/React/Base/RCTJavaScriptLoader.mm
index 133851a1d7f49d..8839095e6a4ea0 100755
--- a/packages/react-native/React/Base/RCTJavaScriptLoader.mm
+++ b/packages/react-native/React/Base/RCTJavaScriptLoader.mm
@@ -19,8 +19,6 @@
 
 NSString *const RCTJavaScriptLoaderErrorDomain = @"RCTJavaScriptLoaderErrorDomain";
 
-const uint32_t RCT_BYTECODE_ALIGNMENT = 4;
-
 @interface RCTSource () {
  @public
   NSURL *_url;
@@ -41,12 +39,7 @@ @implementation RCTSource
 
   RCTSource *source = [RCTSource new];
   source->_url = url;
-  // Multipart responses may give us an unaligned view into the buffer. This ensures memory is aligned.
-  if (parseTypeFromHeader(header) == ScriptTag::MetroHBCBundle && ((long)[data bytes] % RCT_BYTECODE_ALIGNMENT)) {
-    source->_data = [[NSData alloc] initWithData:data];
-  } else {
-    source->_data = data;
-  }
+  source->_data = data;
   source->_length = length;
   source->_filesChangedCount = RCTSourceFilesChangedCountNotBuiltByBundler;
   return source;
@@ -171,7 +164,6 @@ + (NSData *)attemptSynchronousLoadOfBundleAtURL:(NSURL *)scriptURL
 
   facebook::react::ScriptTag tag = facebook::react::parseTypeFromHeader(header);
   switch (tag) {
-    case facebook::react::ScriptTag::MetroHBCBundle:
     case facebook::react::ScriptTag::RAMBundle:
       break;
 
@@ -285,8 +277,7 @@ static void attemptAsynchronousLoadOfBundleAtURL(
         // Validate that the packager actually returned javascript.
         NSString *contentType = headers[@"Content-Type"];
         NSString *mimeType = [[contentType componentsSeparatedByString:@";"] firstObject];
-        if (![mimeType isEqualToString:@"application/javascript"] && ![mimeType isEqualToString:@"text/javascript"] &&
-            ![mimeType isEqualToString:@"application/x-metro-bytecode-bundle"]) {
+        if (![mimeType isEqualToString:@"application/javascript"] && ![mimeType isEqualToString:@"text/javascript"]) {
           NSString *description;
           if ([mimeType isEqualToString:@"application/json"]) {
             NSError *parseError;
diff --git a/packages/react-native/React/CxxBridge/RCTCxxBridge.mm b/packages/react-native/React/CxxBridge/RCTCxxBridge.mm
index fdb89650392edb..5cec2735d448ce 100644
--- a/packages/react-native/React/CxxBridge/RCTCxxBridge.mm
+++ b/packages/react-native/React/CxxBridge/RCTCxxBridge.mm
@@ -1494,11 +1494,6 @@ - (void)executeApplicationScriptSync:(NSData *)script url:(NSURL *)url
   [self executeApplicationScript:script url:url async:NO];
 }
 
-static uint32_t RCTReadUInt32LE(NSData *script, uint32_t offset)
-{
-  return [script length] < offset + 4 ? 0 : CFSwapInt32LittleToHost(*(((uint32_t *)[script bytes]) + offset / 4));
-}
-
 - (void)executeApplicationScript:(NSData *)script url:(NSURL *)url async:(BOOL)async
 {
   [self _tryAndHandleError:^{
@@ -1514,15 +1509,7 @@ - (void)executeApplicationScript:(NSData *)script url:(NSURL *)url async:(BOOL)a
     // hold a local reference to reactInstance in case a parallel thread
     // resets it between null check and usage
     auto reactInstance = self->_reactInstance;
-    if (reactInstance && scriptType == ScriptTag::MetroHBCBundle) {
-      uint32_t offset = 8;
-      while (offset < script.length) {
-        uint32_t fileLength = RCTReadUInt32LE(script, offset);
-        NSData *unit = [script subdataWithRange:NSMakeRange(offset + 4, fileLength)];
-        reactInstance->loadScriptFromString(std::make_unique<NSDataBigString>(unit), sourceUrlStr.UTF8String, false);
-        offset += ((fileLength + RCT_BYTECODE_ALIGNMENT - 1) & ~(RCT_BYTECODE_ALIGNMENT - 1)) + 4;
-      }
-    } else if (scriptType == ScriptTag::RAMBundle) {
+    if (scriptType == ScriptTag::RAMBundle) {
       [self->_performanceLogger markStartForTag:RCTPLRAMBundleLoad];
       auto ramBundle = std::make_unique<JSIndexedRAMBundle>(sourceUrlStr.UTF8String);
       std::unique_ptr<const JSBigString> scriptStr = ramBundle->getStartupCode();
diff --git a/packages/react-native/ReactAndroid/build.gradle b/packages/react-native/ReactAndroid/build.gradle
index f473ba011bd06a..6f5cff2885209a 100644
--- a/packages/react-native/ReactAndroid/build.gradle
+++ b/packages/react-native/ReactAndroid/build.gradle
@@ -454,7 +454,6 @@ android {
 
         buildConfigField("boolean", "IS_INTERNAL_BUILD", "false")
         buildConfigField("int", "EXOPACKAGE_FLAGS", "0")
-        buildConfigField("int", "HERMES_BYTECODE_VERSION", "0")
 
         resValue "integer", "react_native_dev_server_port", reactNativeDevServerPort()
         resValue "integer", "react_native_inspector_proxy_port", reactNativeInspectorProxyPort()
diff --git a/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/common/BUCK b/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/common/BUCK
index f3fc61e4e0b317..211017b73eabe8 100644
--- a/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/common/BUCK
+++ b/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/common/BUCK
@@ -1,4 +1,4 @@
-load("//tools/build_defs/oss:rn_defs.bzl", "HERMES_BYTECODE_VERSION", "react_native_dep", "rn_android_build_config", "rn_android_library")
+load("//tools/build_defs/oss:rn_defs.bzl", "react_native_dep", "rn_android_build_config", "rn_android_library")
 
 SUB_PROJECTS = [
     "network/**/*",
@@ -40,7 +40,6 @@ rn_android_build_config(
     package = "com.facebook.react",
     values = [
         "boolean IS_INTERNAL_BUILD = true",
-        "int HERMES_BYTECODE_VERSION = {}".format(HERMES_BYTECODE_VERSION),
     ],
     visibility = [
         "PUBLIC",
diff --git a/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/common/build/ReactBuildConfig.java b/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/common/build/ReactBuildConfig.java
index 70273030bbe825..b34769a1932a3d 100644
--- a/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/common/build/ReactBuildConfig.java
+++ b/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/common/build/ReactBuildConfig.java
@@ -20,5 +20,4 @@ public class ReactBuildConfig {
   public static final boolean DEBUG = BuildConfig.DEBUG;
   public static final boolean IS_INTERNAL_BUILD = BuildConfig.IS_INTERNAL_BUILD;
   public static final int EXOPACKAGE_FLAGS = BuildConfig.EXOPACKAGE_FLAGS;
-  public static final int HERMES_BYTECODE_VERSION = BuildConfig.HERMES_BYTECODE_VERSION;
 }
diff --git a/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/devsupport/DevServerHelper.java b/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/devsupport/DevServerHelper.java
index e16de601218a23..a28621f77cc9ee 100644
--- a/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/devsupport/DevServerHelper.java
+++ b/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/devsupport/DevServerHelper.java
@@ -14,7 +14,6 @@
 import com.facebook.infer.annotation.Assertions;
 import com.facebook.react.bridge.ReactContext;
 import com.facebook.react.common.ReactConstants;
-import com.facebook.react.common.build.ReactBuildConfig;
 import com.facebook.react.devsupport.interfaces.DevBundleDownloadListener;
 import com.facebook.react.devsupport.interfaces.PackagerStatusCallback;
 import com.facebook.react.devsupport.interfaces.StackFrame;
@@ -427,13 +426,9 @@ private String createSplitBundleURL(String mainModuleID, String host) {
 
   private String createBundleURL(
       String mainModuleID, BundleType type, String host, boolean modulesOnly, boolean runModule) {
-    String runtimeBytecodeVersion =
-        ReactBuildConfig.HERMES_BYTECODE_VERSION != 0
-            ? "&runtimeBytecodeVersion=" + ReactBuildConfig.HERMES_BYTECODE_VERSION
-            : "";
     return String.format(
         Locale.US,
-        "http://%s/%s.%s?platform=android&dev=%s&minify=%s&app=%s&modulesOnly=%s&runModule=%s%s",
+        "http://%s/%s.%s?platform=android&dev=%s&minify=%s&app=%s&modulesOnly=%s&runModule=%s",
         host,
         mainModuleID,
         type.typeID(),
@@ -441,8 +436,7 @@ private String createBundleURL(
         getJSMinifyMode(),
         mPackageName,
         modulesOnly ? "true" : "false",
-        runModule ? "true" : "false",
-        runtimeBytecodeVersion);
+        runModule ? "true" : "false");
   }
 
   private String createBundleURL(String mainModuleID, BundleType type) {
diff --git a/packages/react-native/ReactAndroid/src/main/jni/react/jni/CatalystInstanceImpl.cpp b/packages/react-native/ReactAndroid/src/main/jni/react/jni/CatalystInstanceImpl.cpp
index e44913e4fd08e2..e3345f038be28b 100644
--- a/packages/react-native/ReactAndroid/src/main/jni/react/jni/CatalystInstanceImpl.cpp
+++ b/packages/react-native/ReactAndroid/src/main/jni/react/jni/CatalystInstanceImpl.cpp
@@ -290,30 +290,6 @@ void CatalystInstanceImpl::jniLoadScriptFromFile(
   }
 
   switch (getScriptTagFromFile(fileName.c_str())) {
-    case ScriptTag::MetroHBCBundle: {
-      std::unique_ptr<const JSBigFileString> script;
-      RecoverableError::runRethrowingAsRecoverable<std::system_error>(
-          [&fileName, &script]() {
-            script = JSBigFileString::fromPath(fileName);
-          });
-      const char *buffer = script->c_str();
-      uint32_t bufferLength = (uint32_t)script->size();
-      uint32_t offset = 8;
-      while (offset < bufferLength) {
-        uint32_t segment = offset + 4;
-        uint32_t moduleLength =
-            bufferLength < segment ? 0 : *(((uint32_t *)buffer) + offset / 4);
-
-        reactInstance->loadScriptFromString(
-            std::make_unique<const JSBigStdString>(
-                std::string(buffer + segment, buffer + moduleLength + segment)),
-            sourceURL,
-            false);
-
-        offset += ((moduleLength + 3) & ~3) + 4;
-      }
-      break;
-    }
     case ScriptTag::RAMBundle:
       instance_->loadRAMBundleFromFile(fileName, sourceURL, loadSynchronously);
       break;
diff --git a/packages/react-native/ReactCommon/cxxreact/JSBundleType.cpp b/packages/react-native/ReactCommon/cxxreact/JSBundleType.cpp
index 036397c811356f..8e6f17ab00822c 100644
--- a/packages/react-native/ReactCommon/cxxreact/JSBundleType.cpp
+++ b/packages/react-native/ReactCommon/cxxreact/JSBundleType.cpp
@@ -11,7 +11,6 @@ namespace facebook {
 namespace react {
 
 static uint32_t constexpr RAMBundleMagicNumber = 0xFB0BD1E5;
-static uint32_t constexpr MetroHBCBundleMagicNumber = 0xFFE7C3C3;
 
 // "Hermes" in ancient Greek encoded in UTF-16BE and truncated to 8 bytes.
 static uint64_t constexpr HermesBCBundleMagicNumber = 0x1F1903C103BC1FC6;
@@ -20,8 +19,6 @@ ScriptTag parseTypeFromHeader(const BundleHeader &header) {
   switch (header.magic32.value) {
     case RAMBundleMagicNumber:
       return ScriptTag::RAMBundle;
-    case MetroHBCBundleMagicNumber:
-      return ScriptTag::MetroHBCBundle;
     default:
       return ScriptTag::String;
   }
@@ -33,8 +30,6 @@ const char *stringForScriptTag(const ScriptTag &tag) {
       return "String";
     case ScriptTag::RAMBundle:
       return "RAM Bundle";
-    case ScriptTag::MetroHBCBundle:
-      return "Metro Hermes Bytecode Bundle";
   }
   return "";
 }
diff --git a/packages/react-native/ReactCommon/cxxreact/JSBundleType.h b/packages/react-native/ReactCommon/cxxreact/JSBundleType.h
index 0dee53c0be9130..7a966a94b7e8f9 100644
--- a/packages/react-native/ReactCommon/cxxreact/JSBundleType.h
+++ b/packages/react-native/ReactCommon/cxxreact/JSBundleType.h
@@ -27,7 +27,6 @@ namespace react {
 enum struct ScriptTag {
   String = 0,
   RAMBundle,
-  MetroHBCBundle,
 };
 
 /**
diff --git a/packages/rn-tester/BUCK b/packages/rn-tester/BUCK
index 284c184fb3560a..ef3f2549ea0ca0 100644
--- a/packages/rn-tester/BUCK
+++ b/packages/rn-tester/BUCK
@@ -1,5 +1,4 @@
 load("@fbsource//tools/build_defs:glob_defs.bzl", "subdir_glob")
-load("@fbsource//xplat/hermes/defs:hermes.bzl", "HERMES_BYTECODE_VERSION")
 load("//tools/build_defs:fb_native_wrapper.bzl", "fb_native")
 load("//tools/build_defs:fb_xplat_platform_specific_rule.bzl", "fb_xplat_platform_specific_rule")
 load("//tools/build_defs:fb_xplat_resource.bzl", "fb_xplat_resource")
@@ -138,9 +137,7 @@ fb_apple_test(
         "QuartzCore",
         "UIKit",
     ],
-    preprocessor_flags = get_objc_arc_preprocessor_flags() + [
-        "-DHERMES_BYTECODE_VERSION={}".format(HERMES_BYTECODE_VERSION),
-    ] + get_preprocessor_flags_for_build_mode(),
+    preprocessor_flags = get_objc_arc_preprocessor_flags() + get_preprocessor_flags_for_build_mode(),
     visibility = [
         "//fbobjc/Libraries/FBReactKit:workspace",
     ],
diff --git a/packages/rn-tester/RNTesterUnitTests/RCTBundleURLProviderTests.m b/packages/rn-tester/RNTesterUnitTests/RCTBundleURLProviderTests.m
index 89164bc0bb4f69..004da62a6644cc 100644
--- a/packages/rn-tester/RNTesterUnitTests/RCTBundleURLProviderTests.m
+++ b/packages/rn-tester/RNTesterUnitTests/RCTBundleURLProviderTests.m
@@ -22,42 +22,22 @@
 
 static NSURL *localhostBundleURL()
 {
-#ifdef HERMES_BYTECODE_VERSION
-  return [NSURL
-      URLWithString:
-          [NSString
-              stringWithFormat:
-                  @"http://localhost:8081/%@.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&runtimeBytecodeVersion=%u&app=com.apple.dt.xctest.tool",
-                  testFile,
-                  HERMES_BYTECODE_VERSION]];
-#else
   return [NSURL
       URLWithString:
           [NSString
               stringWithFormat:
                   @"http://localhost:8081/%@.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=com.apple.dt.xctest.tool",
                   testFile]];
-#endif
 }
 
 static NSURL *ipBundleURL()
 {
-#ifdef HERMES_BYTECODE_VERSION
-  return [NSURL
-      URLWithString:
-          [NSString
-              stringWithFormat:
-                  @"http://192.168.1.1:8081/%@.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&runtimeBytecodeVersion=%u&app=com.apple.dt.xctest.tool",
-                  testFile,
-                  HERMES_BYTECODE_VERSION]];
-#else
   return [NSURL
       URLWithString:
           [NSString
               stringWithFormat:
                   @"http://192.168.1.1:8081/%@.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=com.apple.dt.xctest.tool",
                   testFile]];
-#endif
 }
 
 @implementation NSBundle (RCTBundleURLProviderTests)
diff --git a/tools/build_defs/oss/rn_defs.bzl b/tools/build_defs/oss/rn_defs.bzl
index c1ad82e48bb33d..0813b09ccd5e91 100644
--- a/tools/build_defs/oss/rn_defs.bzl
+++ b/tools/build_defs/oss/rn_defs.bzl
@@ -428,8 +428,6 @@ def react_fabric_component_plugin_provider(name, native_class_func):
 def react_cxx_module_plugin_provider(name, function):
     return None
 
-HERMES_BYTECODE_VERSION = -1
-
 RCT_IMAGE_DATA_DECODER_SOCKET = None
 RCT_IMAGE_URL_LOADER_SOCKET = None
 RCT_URL_REQUEST_HANDLER_SOCKET = None