im not sure i understand what you mean by cleanbackup..
in the quick tweak menu...the option z is for restore to default....i dont remember any other options showing up..

also i tried nfs shift....the game loads...but i cant handle it properly...so im guessing its the accelerometer..i havent dropped the phone or anything...

the problem started when once the whole os crashed and i had to hard reboot it...ever since then its been like this