heres the story, my friend has like 1500 songs and hardly has enough memory for cydia and apps and junk. i was gonna sink his ipod to my itunes account where i have a few songs and some apps he has a 8Gb 3G 3.1.2 ipod jailbroken when i hook up his ipod to my itunes, it will ask if i want to erase and sync the stuff from my itunes. ill click yes. I have a 3G 32GB 3.1.3 if i erase and sync, will it upgrade his ipod and will he lose his jailbreak??