If you're interested in downloading and installing this specific version of the YouTube APK, be aware that:
Running YouTube on a legacy device like those with has become increasingly difficult as Google has shifted its official support to Android 8.0 and above. If you try to use the standard app from the Play Store, you will likely encounter a "Switch to YouTube.com" or "Update Required" block. youtube apk android 511
“Downloading APKs from third-party sites carries risk. Always verify SHA-1 signature. Never install ‘YouTube Premium Cracked’ or similar from unknown forums – they often contain malware targeting old Android versions.” If you're interested in downloading and installing this
, but standard use will likely result in a server error (Error 400). YouTube Go: Always verify SHA-1 signature
If you absolutely must have the official look, install (logging out) or find a ReVanced builder.
Here is everything you need to know about getting YouTube running on Android 5.1.1.