flutter-rsa Failed to lookup symbol 'RSABridgeCall': dlsym(RTLD_DEFAULT, RSABridgeCall): symbol not found

On Android, the latest Flutter plugin version (fast_rsa: ^3.8.5) works correctly. On iOS, the app runs fine in release mode on a local device, but after uploading to TestFlight, it encounters the issue described above.

After researching, I found that the latest plugin version uses native iOS fast_rsa 0.7.0, which causes the problem. The app works correctly if the native iOS fast_rsa is forced to version 0.6.0.

Sep 18 '25 08:09 FlutterEngineers

Hi we have released a new version using force load to prevent stripping on release/profile https://pub.dev/packages/fast_rsa/versions/3.8.6

Oct 25 '25 01:10 jerson

I’m still facing the same issue on iOS even after upgrading to the latest version of the fast_rsa plugin (v3.8.6). The issue does not occur on Android, and the app works perfectly fine in both debug and release modes locally. However, once the app is uploaded to TestFlight, it fails to function as expected.

Environment Details

Device: iPhone 13 Pro

Platform: iOS

iOS Version: iOS 26

Flutter Version: Latest Stable release

fast_rsa Version: 3.8.6

Xcode Version 26.0.1

Build Mode: Works fine locally in Release mode, but fails in TestFlight/Production mode.