You proceed to Jailbreak with 3uTools> Install cydia> Update> Install File Filza and follow the instructions below.
Download youtube first (add source: beta.unlimapps.com> Install App Admin to Downgrade low version to download or use old iTunes account to download section, find Youtube download lower version)
Use iFile or Filza File Manager> Select var / containers / Bundle / Application / Youtube.app, find info.plist file, change the version to 14.06.7
Then go back> it asks if you want to save> Click OK
TUTORIAL
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iPhone