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by gkefalas 5835 days ago
Sure; there are a couple out there. Lifehacker's was the most straightforward and detailed. The process is much the same as jailbreaking. http://lifehacker.com/5572003/how-to-downgrade-your-iphone-3...

I had some shenanigans with it being an older backup and so had to re-transfer my email accounts from my compy to the phone, but that was just a couple checkboxes in iTunes and setting up MobileMe.