You might have a bad update, or you're running it on an incorrect game region. Or the code itself is bad. If any of those things occur you can get booted back to the system repair menu. I've had that happen COUNTLESS times while modding a game with ProDG or Netcheat or anything like that.
I was thinking about that, im running rebug dex 4.81 and i tested this out on 3 different games. usually when im running the wrong region it will only freeze my game but i have tested this with each one just to be sure but it seems they all have the same outcome. I know i can just easily use a cheat pkg but the only issue with that is i dont like having god mode active and most pkgs. usually have it. I was also thinking of trying to just use console manager to manually put the codes in but i cant seem to find the offsets for most of them to even do that so im stuck lmao