iOS 5 beta 7 activation on iPhone 3GS 06.15.00 baseband
I have developer account and I'm trying to install iOS 5 beta 7 (no jailbreak) on iPhone 3GS which is registered with my account. It has installed successfully but when trying to activate with iTunes it says there is no SIM card installed, although I have inserted AT&T SIM card which has previously successfully activated several iPhones.
After that I've restored to iOS 4.3.5 and again iTunes does not recognize AT&T card.
I just realized that somehow baseband is upgraded to 06.15.00.
So, my questions are:
1. What could be a problem with iTunes activation? Is it baseband?
2. If yes, is there any workaround for it?
3. If I restore another iPhone (with normal baseband) to iOS 5 beta 7 will it upgrade baseband to 06.15.00 or I can safely do that? (I'm not sure if redsn0w was used on that device before)
Thanks in advance,