I made a huge mistake of upgrading to iOS 6 today. I hate the release and I want OUT. When I try to downgrade by restoring to IPSW for 5.1.1 it tells me that the device isn't eligible for the build. What do I have to do to make iTunes accept this IPSW file and run the install?
You can read how to downgrade to iOS 5.1.1 on my blog : http://antonpug.com/blog
Best Answer
In general, you will need to jailbreak (if that's even possible on the new iOS) the device to revert the OS. iOS upgrades (OTA or via iTunes) are one way and have been that way (unable to downgrade) since the 1.0.
Hopefully someone will see your plea for help once they know if and how a jailbreak will work. In the past you needed to get shsh keys from Apple and there was a limited window after updates to get the old keys. If this is so, time is of the essence for you. I haven't been keeping up on jailbreaking enough to even recommend a wiki or reputable source other than to recommend you search the internet.
Of course if someone hasn't already asked a how to jailbreak iOS 6 question here, you are free to ask that question as well or edit that into this question.