To get YouTube working, you cannot use the latest app version. Instead, you must install an older version of the app (an APK file) that was designed for the Lollipop era.
If the application launches but prevents playback with an update prompt, you can use a version-spoofing method via advanced tools: download youtube for android 5.1.1
The most reliable app for Android 5.1.1 is (open-source, no Google dependencies). To get YouTube working, you cannot use the
While the Google Play Store has moved on, Android 5.1.1 devices can still run YouTube through the installation of legacy APKs. By finding a version of the app from the 2017–2018 era, you can restore video functionality to your older hardware, though you may have to sacrifice modern features and account security to do so. To get YouTube working