How about searching ? This is the eleventeenth thread you've made over the past few days where you could easily have searched & found an answer to your question.
Lazy much ?
Edit - Everyone else - stop spoonfeeding this guy, he's never going to learn anything if he gets answers to every single question he asks.
If it's important enough to cause you grief if it's lost, back it up. No excuses
Trolling for thanks is lame
Does Samsung's auto-brightness implementation crap drive you to self-harm ? A solution !
Failure to search is the leading cause of male impotence on XDA
If you don't know how to recover if things go wrong, what are you doing flashing custom roms ?