HI peoples, I have an iPod Touch 3G currently running iOS 4.1. I am wanting 4.2.1 software, so my plan was to upgrade phone all the way to whatever the most current software is through iTunes, then downgrade to 4.2.1 for my purposes. How would I go about downgrading? I do not have the restore file of old software i need in my computer (I am on a PC, so PC friendly directions please!) A link to the 4.2.1 software would be nice, aswell as directions. PLEASE HELP!