Before installing any APK, you must allow your browser or file manager to install software outside the Play Store.
Versions 17.10.x and above require Android 6.0+. Do not install them. Stick to v17.09.37 or v16.xx for maximum stability. download youtube old version for android 5.1.1
However, your device is not dead yet. By downloading an specifically built for Android 5.1.1, you can restore video playback, access your subscriptions, and keep your device useful. Before installing any APK, you must allow your