diff --git a/React/Base/RCTJavaScriptLoader.h b/React/Base/RCTJavaScriptLoader.h
index e4123cb3b10..729fa371804 100755
--- a/React/Base/RCTJavaScriptLoader.h
+++ b/React/Base/RCTJavaScriptLoader.h
@@ -92,7 +92,6 @@ typedef void (^RCTSourceLoadBlock)(NSError *error, RCTSource *source);
  * RCTJavaScriptLoaderErrorDomain and the code RCTJavaScriptLoaderErrorCannotBeLoadedSynchronously.
  */
 + (NSData *)attemptSynchronousLoadOfBundleAtURL:(NSURL *)scriptURL
-                               runtimeBCVersion:(int32_t)runtimeBCVersion
                                    sourceLength:(int64_t *)sourceLength
                                           error:(NSError **)error;
 
diff --git a/React/Base/RCTJavaScriptLoader.mm b/React/Base/RCTJavaScriptLoader.mm
index a95446b0093..d902f0c92d0 100755
--- a/React/Base/RCTJavaScriptLoader.mm
+++ b/React/Base/RCTJavaScriptLoader.mm
@@ -19,8 +19,6 @@
 
 NSString *const RCTJavaScriptLoaderErrorDomain = @"RCTJavaScriptLoaderErrorDomain";
 
-static const int32_t JSNoBytecodeFileFormatVersion = -1;
-
 const UInt32 RCT_BYTECODE_ALIGNMENT = 4;
 UInt32 RCTReadUInt32LE(NSData *script, UInt32 offset)
 {
@@ -92,10 +90,7 @@ RCT_NOT_IMPLEMENTED(-(instancetype)init)
 {
   int64_t sourceLength;
   NSError *error;
-  NSData *data = [self attemptSynchronousLoadOfBundleAtURL:scriptURL
-                                          runtimeBCVersion:JSNoBytecodeFileFormatVersion
-                                              sourceLength:&sourceLength
-                                                     error:&error];
+  NSData *data = [self attemptSynchronousLoadOfBundleAtURL:scriptURL sourceLength:&sourceLength error:&error];
   if (data) {
     onComplete(nil, RCTSourceCreate(scriptURL, data, sourceLength));
     return;
@@ -112,7 +107,6 @@ RCT_NOT_IMPLEMENTED(-(instancetype)init)
 }
 
 + (NSData *)attemptSynchronousLoadOfBundleAtURL:(NSURL *)scriptURL
-                               runtimeBCVersion:(int32_t)runtimeBCVersion
                                    sourceLength:(int64_t *)sourceLength
                                           error:(NSError **)error
 {
@@ -203,27 +197,6 @@ RCT_NOT_IMPLEMENTED(-(instancetype)init)
       return nil;
 #endif
     }
-    case facebook::react::ScriptTag::BCBundle:
-      if (runtimeBCVersion == JSNoBytecodeFileFormatVersion || runtimeBCVersion < 0) {
-        if (error) {
-          *error = [NSError
-              errorWithDomain:RCTJavaScriptLoaderErrorDomain
-                         code:RCTJavaScriptLoaderErrorBCNotSupported
-                     userInfo:@{NSLocalizedDescriptionKey : @"Bytecode bundles are not supported by this runtime."}];
-        }
-        return nil;
-      } else if ((uint32_t)runtimeBCVersion != header.version) {
-        if (error) {
-          NSString *errDesc = [NSString
-              stringWithFormat:@"BC Version Mismatch. Expect: %d, Actual: %u", runtimeBCVersion, header.version];
-
-          *error = [NSError errorWithDomain:RCTJavaScriptLoaderErrorDomain
-                                       code:RCTJavaScriptLoaderErrorBCVersion
-                                   userInfo:@{NSLocalizedDescriptionKey : errDesc}];
-        }
-        return nil;
-      }
-      break;
   }
 
   struct stat statInfo;
diff --git a/ReactCommon/cxxreact/JSBundleType.cpp b/ReactCommon/cxxreact/JSBundleType.cpp
index c676c738e0a..05bacb4107c 100644
--- a/ReactCommon/cxxreact/JSBundleType.cpp
+++ b/ReactCommon/cxxreact/JSBundleType.cpp
@@ -13,14 +13,11 @@ namespace facebook {
 namespace react {
 
 static uint32_t constexpr RAMBundleMagicNumber = 0xFB0BD1E5;
-static uint32_t constexpr BCBundleMagicNumber = 0x6D657300;
 
 ScriptTag parseTypeFromHeader(const BundleHeader &header) {
   switch (folly::Endian::little(header.magic)) {
     case RAMBundleMagicNumber:
       return ScriptTag::RAMBundle;
-    case BCBundleMagicNumber:
-      return ScriptTag::BCBundle;
     default:
       return ScriptTag::String;
   }
@@ -32,8 +29,6 @@ const char *stringForScriptTag(const ScriptTag &tag) {
       return "String";
     case ScriptTag::RAMBundle:
       return "RAM Bundle";
-    case ScriptTag::BCBundle:
-      return "BC Bundle";
   }
   return "";
 }
diff --git a/ReactCommon/cxxreact/JSBundleType.h b/ReactCommon/cxxreact/JSBundleType.h
index 0a5bad0894c..45a90458188 100644
--- a/ReactCommon/cxxreact/JSBundleType.h
+++ b/ReactCommon/cxxreact/JSBundleType.h
@@ -27,7 +27,6 @@ namespace react {
 enum struct ScriptTag {
   String = 0,
   RAMBundle,
-  BCBundle,
 };
 
 /**