Between 2012 and 2015, Google transitioned YouTube’s backend from a deprecated XML-based API (version 2.0) to a modern JSON-based API (version 3.0). The last version of the official YouTube app compatible with iOS 5.1.1——still relies on the old API. When you launch it, it sends a request to Google’s servers using outdated authentication methods, and the servers simply reject it.
Add the InvoxiPlayGames repo to Cydia and install TubeFixer (Beta) . Get a Google API Key: Go to the Google Cloud Console . Enable the YouTube Data API v3 . Create an API Key and copy it to your device. youtube ipa for ios 511 verified
: The final version officially supported by iOS 5. 2. Installation & Fix (TubeRepair) YouTube - App Store - Apple Between 2012 and 2015