diff --git a/React/Base/RCTJavaScriptLoader.h b/React/Base/RCTJavaScriptLoader.h
index 1d32372cd56..c1d30ce2016 100755
--- a/React/Base/RCTJavaScriptLoader.h
+++ b/React/Base/RCTJavaScriptLoader.h
@@ -20,6 +20,7 @@ NS_ENUM(NSInteger) {
   RCTJavaScriptLoaderErrorFailedStatingFile = 3,
   RCTJavaScriptLoaderErrorURLLoadFailed = 3,
   RCTJavaScriptLoaderErrorBCVersion = 4,
+  RCTJavaScriptLoaderErrorBCNotSupported = 4,
 
   RCTJavaScriptLoaderErrorCannotBeLoadedSynchronously = 1000,
 };
diff --git a/React/Base/RCTJavaScriptLoader.mm b/React/Base/RCTJavaScriptLoader.mm
index 1d0f3cdec88..eacdf024f22 100755
--- a/React/Base/RCTJavaScriptLoader.mm
+++ b/React/Base/RCTJavaScriptLoader.mm
@@ -142,10 +142,19 @@ RCT_NOT_IMPLEMENTED(- (instancetype)init)
     return nil;
 
   case facebook::react::ScriptTag::BCBundle:
-    if (header.BCVersion != runtimeBCVersion) {
+    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.BCVersion) {
       if (error) {
         NSString *errDesc =
-          [NSString stringWithFormat:@"BC Version Mismatch. Expect: %d, Actual: %d",
+          [NSString stringWithFormat:@"BC Version Mismatch. Expect: %d, Actual: %u",
                     runtimeBCVersion, header.BCVersion];
 
         *error = [NSError errorWithDomain:RCTJavaScriptLoaderErrorDomain