Supposedly, 2.2.1 is still signed. When I try to downgrade in iTunes 12 I am hit with a error every time. I then tried 3.1.3, it made it to the end but got stuck in recovery. I ran RecBoot and the install proceeded fine. When I try 2.2.1 I am hit with errors like 20,1600. I remember something about needing to downgrade iTunes to 9 or 10. I tried multiple computers, resulting in this. Anyone know the issue? I know iOS 2 has less features than iOS 3 & 4, I just wanna try it out and see how fast the iPhone 3G was at release. Thanks!