To get rid of the corrupt message you can do this :
But probably, before that, you’ll have to flash back to the A.0105 stock ROM.
In order to do so, you should download the full stock dump here and follow the instructions to flash it here. Do not forget to flash both slots and to:
If you are working in a shell environment (*nix or Windows) you can run all the instructions as a bash script like this (don’t forget to change the active slot when necessary: current is “a”):