I have an iPad 2 GSM with iOS 4.3.5 that I would like to upgrade to iOS 5.1.1.
I tried to upgrade using an Apple 5.1.1 image, without success due to the signing window for 5.1.1 being closed.
If I enroll in the Apple Developer program ($$$) will it be possible for me to upgrade to iOS 5.1.1? How about downgrade to other versions (e.g. 4.1)?