Yes, it took me a little bit to know how to do it but it´s easy. Download the iOS 2.0 ipsw and also 2.2.1. DFU Mode and install iOS 2.0. A spinning wheel will appear and after the restore it will be in a recovery loop. Then, choose the 2.2.1 ipsw and a status bar will appear. After that, you just need to use TinyUmbrella to exit the recovery (it wont be a recovery loop). Dont try to do the same proccess with the 2.0.1, 2.0.2 etc it just work with 2.2.1. Briefly, install the 2.0 and after that, install the 2.2.1.