I was not able to go back from beta 3 first release to 2.2.1 on iPhone 2g , on mac os 10.5.6 but after I upgrade to beta 3 2nd release it worked like a charm to go back to 2.2.1
All this because I can not bypass the itunes,( I don't have AT&T) .
If you can find a way to bypass the itunes after you install beta 3 , please let me know.
I am a registered dev with apple.
I had trouble posting this, sorry if is going to show twice.

I was not able to go back from beta 3 first release to 2.2.1 on iPhone 2g , on mac os 10.5.6 but after I upgrade to beta 3 2nd release it worked like a charm to go back to 2.2.1
All this because I can not bypass the itunes,( I don't have AT&T) .
If you can find a way to bypass the itunes after you install beta 3 , please let me know.
I am a registered dev with apple.