they make it very strict in their recent patches.
follow these steps.
1. uninstall the game first.
2. clear your phone's cache with any cleaner (c cleaner or with built cleaner)
3. please check the permissions of your file manager. is allowed to make changes or not.
does not work on android 6+,
it works on android 4, and 5.
and for the emulator use, NOX with android 4. and install unsigned apk.
and if you want to play with original apk on your phone. then you will have to use the paid service by me. (Real VIP and gems)
My original one is banned for no reason, so thats why i wanted to give the mod a go, have to use device id changer because they banned the id, even had paid stuff and everything there, so i guess i'm just gonna use the emulator. Thanks though.