For Ios 5.1.1 | Youtube Ipa
Clear Safari cookies and website data (Settings → Safari). Then delete YouTube, reboot, reinstall.
Open YouTube. When it asks for permissions, allow everything. If it asks to “Update,” tap “Later.” Youtube Ipa For Ios 5.1.1
If you have previously "purchased" YouTube on your Apple ID, you can sometimes download a compatible version directly by going to Clear Safari cookies and website data (Settings → Safari)