Version is widely reported as one of the last stable versions for Lollipop. Find older versions on APKMirror.

Another open-source alternative that is often more compatible with older graphics drivers than the modern YouTube app. 4. Performance Tips for 5.1.1

to find specific legacy versions. Just ensure "Unknown Sources" is enabled in your security settings before installing. 2. The Browser Workaround (Most Reliable)

has largely ended, with most current versions requiring Android 9.0 or higher. While the official app may show "This version of YouTube is out of date," you can still access YouTube using legacy APKs, third-party clients, or mobile browsers. Working Methods for Android 5.1.1 Official Legacy APKs