Help upgraded iphone to firmware 3.0 and now my power button is not working so i cant downgrade or put in dfu mode. When I try to downgrade I keep getting error 20. However my iphone is now stuck in emergency call mode and thats the only screen it is able to access.The funny thing is that the iphone is still able to receive calls and at this point thats the only function it does as the screen never moves off the emergency call screen. Anyone have an idea on how to solve this problem.