if people have not realised yet this firmware updates the modem firmware so you CANNOT downgrade from it (i just tried) so please be aware you have been warned
Ooh, this will hurt if true. And to be totally fair, you can downgrade but not make any calls.
pppl here comes my next problem after flashed back to 1.1
My phone cant recognize my sim card
Looks like dj_steve was right. In that case, you're SOL until you either move back to the RC for the time being or wait for the official update to come out.