I have firmware 3.1.3 on my 3G 32GB Ipod Touch. I want to downgrade to 3.1.2 so I can jailbreak. I've tried the shift+restore way and selecting the 3.1.2 firmware in itunes, but that doesn't work, it says "The Ipod could not be restored. The device is eligible for the requested build.". Its either that or is there a way to jailbreak 3.1.3 on 32GB 3G?