One of the most common problems after Apple releases its the latest
firmware update for the iPhone is that some users who have jailbroken
their iPhone end up losing the jailbreak and all the jailbreak iPhone apps and if they have unlocked their iPhone end up locking their iPhone if they accidentally upgrade to the latest firmware update.
One of our readers, just commented on our step-by-step guide to downgrade from iPhone firmware 2.2 to 2.1 to tell us that he was able to successfully downgrade his iPhone 3G back to firmware 2.2 and jailbreak it. We have updated the guide to downgrade from iPhone firmware 2.2.1 to firmware 2.2.