You may come across names like , Cercube , or iVanced when searching for "YouTube IPA for iOS". These are modified versions of the YouTube app that offer features like background playback and ad blocking.
When you try to open the App Store on an iOS 5.1.1 device, you will likely get errors or find that apps are incompatible. This is because modern API technologies used by YouTube (v20+), which now require iOS 16 or newer, are completely incompatible with the 2012-era iOS 5.1.1. youtube ipa for ios 511