Cydia programs and files, really messes things up had to do the whole process over! I really should have known better, I was being lazy! This process is not for the faint of heart and I would recommend after my experience doing this and spending way too much time doing it and its still not right, NOT, doing this untethered JB if your happy with things the way they are. This reboot thing is a real PIA! You have to reboot like every time you install a major program in Cydia and this reboot takes a lot of time. The thought of reloading all of this music, files, books and apps when a tethered JB comes around is enough to make me sick to my stomach! Don't let anyone or most importantly yourself talk you into to going down this treacherous road! There is not that big an improvement and things are very buggy, not as stable, infidiock does not work, and the time it takes is just out of control. I should have waited.