YouTube has updated its API protocols multiple times since 2013. Older API versions used by v5.1.1 have likely been retired.
Do not just download the first result. Only use reputable APK archives. The magic version for Android 5.1.1 is (nodpi or 320dpi depending on your device). app youtube android 5.1.1
Since the official app is largely non-functional, these are the most reliable alternatives to suggest to your readers: YouTube Mobile Web (Recommended) YouTube has updated its API protocols multiple times
NewPipe is widely considered the best lightweight, open-source YouTube client for older hardware. open-source YouTube client for older hardware.
YouTube has updated its API protocols multiple times since 2013. Older API versions used by v5.1.1 have likely been retired.
Do not just download the first result. Only use reputable APK archives. The magic version for Android 5.1.1 is (nodpi or 320dpi depending on your device).
Since the official app is largely non-functional, these are the most reliable alternatives to suggest to your readers: YouTube Mobile Web (Recommended)
NewPipe is widely considered the best lightweight, open-source YouTube client for older hardware.