krpton ?

Hi somehow Krypton was installed over Jarvis on my Nvidea shield and now nothing works,none of the settings i had were mitigated, the functions on the remote are not working and i can’t install anything though everything else on the shield still works fine, tried the config wizard didn’t help and unable to find way to change it back also i wasn’t asked if i wanted the upgrade either. If anyone has an answer it would be greatly appreciated,