To me it sounds like it can Restore the Backup file from a previous state of the phone.
Since I couldn't fully restore all the data at the login screen (got stuck) I skip it using #*DEVMODE#, so I though "I'm going to use this to make everything right"
Now it is stuck at 90% and I have no idea what to do:
? Use the back gesture to see if it stops
? Close the app
Reboot the phone...

Do you know how this function is supposed to work?