hello, the backlight on my ipod touch went out and i need to take it to the store so i can get it replaced...only problem is that I have done the jailbreak on it. I have gotten all of my music off of random computers most of which I no longer have access to, and i would really like to keep it. if I simply do an update to the latest software version, will this be enough to get rid of the jailbreak? or will I need to do a full restore? thank you for any help!