In short, the experience will be functional but far from perfect. You may find that some videos refuse to play or that the app crashes unexpectedly due to incompatibility with modern YouTube servers.
Edit those values to a current version number (such as 19.10.35 ). Save the file, force-close YouTube, and restart it. Better Alternatives for Android 5.1.1 youtube apk android 511
: Tap the APK file and approve the system permissions requests. In short, the experience will be functional but
: This means the APK you downloaded requires a higher version of Android (like Android 6.0 or 7.0). Double-check that you downloaded version 16.40.36 or lower. Save the file, force-close YouTube, and restart it
Even if you successfully install version 16.40.36, server-side changes by Google may still block video playback or account login. If the official legacy app fails, these lightweight alternatives work on Android 5.1.1. 1. NewPipe (Legacy Extended Build)