The Info:

This guide is pretty much just for the iPhone 3G and the iPhone 2G. The iTouchs should be able to downgrade like normal. The problem with the iPhones is that the baseband is updated when you upgraded to 3.0. iTunes is incapable of downgrading the baseband and realizes that the baseband is not what it should be on 2.2.1, so it gives you a 16xx error. This guide should help you successfully downgrade from 3.0 to 2.2.1.

The Info:

I’ve created my own Cydia repo to host apps that I can’t find on any other repo, such as GriP and the newest version of the Five Icon Dock. Instructions for adding my repo are below. If you want a list of the packages available, check out: Cydia Repo | iPhone/iTouch Guides.

The Info:

One of the most troublesome things about jailbreaking is putting your iPhone or iTouch into DFU mode. Apple designed DFU mode to be hard to access and they did a good job at that. Hopefully this guide will help you enter DFU mode with little trouble.