I want to upgrade to 4.1 iOS from 3.1.3 (jailbroken, 32gb ipod 3g), could someone please show me how to do so? in itunes it only lets me upgrade to 4.2, and i've heard that the only jailbreak for 4.2 is tethered, so 4.1 seems like the best option. if someone could show me how or direct me to a guide or something would be awesome and greatly appreciated.