I recently restored my ipod (it was filled to the brim with songs and stuff, and set it up as a new ipod. Before it was restored, I had neglected to update it to 4.3.5, so it is 4.2.1 right now. Unfortunately whenever I go to update it my computer says it is the newest version, and when I manually downloaded the update, it said that it is an incompatible file. help?