Okay. So I've used iBB to mess with files before and managed to put a hacked save file into Kim Kardashian: Hollywood. Today I tried with Fallout Shelter and all attempts I've made have failed because I received error -20.
I'm using an iPhone 6+, I'm on iOS 9.1. I'm also UNJAILBROKEN.
Things I've tried:
Using different save files.
Reinstalling iBB
Backing up my phone several times.
Just to add, I hacked the Kim K game several weeks ago. Perhaps Apple patched it but I have no idea. I really want to play Fallout Shelter, so please help!