Try the 2.0 to 1.1.4 downgrade guide that someone posted to this forum (
http://www.modmyi.com/forums/gen...0-1-1-4-a.html). It takes you step by step through the process. It will tell you to uninstall your current version of itunes & download 7.5. I had a problem getting itunes 7.5 to recognize my iphone until I tried it the following day. When I was done with the whole process my iphone was out of recovery mode however, it was not getting a signal or noticing the T-Mobile service. I walked through the whole process maybe two more times & finally after unlocking with ziphone everything was back to normal. I had to go through all of this because I attempted the 2.0 upgrade with my 1st generation iphone...which is not recommended as of yet.