I recently upgraded my iPhone 3g to the new iOS version 4. I wasn’t terribly impressed with the limited features that are available on the 3g handset, and found the new OS to be slow enough to drive me nuts.
I resolved to go back to the old OS and get my speed back. (There wasn’t anything I would miss anyway on my old phone) It turns out it was harder to downgrade that I had thought. I spun my wheels for a while and ended up asking my buddy Ian for ideas about it. He pointed me to this blog entry which ended up being exactly the trick I needed. Now I’m back on the prior OS and working as expected again. Thanks for the tip Ian!
Downgrade from iPhone OS 4.0 Beta, Back to iPhone OS 3.1.3 | Mac|Life.