found a way to play with version 3.8.4 (with mod) without need to update to 3.8.5!
Since an update to 3.8.5 would stop the mod from working, I simply opened Filza and went to the Location "/var/mobile/Containers/Bundle/Application/Dokkan Battle/BNGI0221.app/" and opened the "info.plist".
there I scrolled down till I saw the Value "3.8.4" on "CFBundleShortVersionString", I changed it to "3.8.5" and did a UICACHE&RESPRING.
Started the game and it downloaded the new data and now I'm in the game.
WARNING:
I dont know if bandai can somehow track thin and ban the account for this!
this is just something that I tested know for the first time, with this method you are unable to see/use the new features of Version 3.8.5 since you have not updated, you just fake the Version so that the App and the Servers think that you have updated.