For those who have accidentally upgraded your iPhone 3G to firmware 2.2.1, this is a great news for you. As you may know, by upgrading the iPhone 3G to firmware 2.2.1, Apple also updates the baseband version of iPhone to 2.30.00. Presently, this baseband version is not supported by yellowsn0w, the free unlock software for iPhone 3G. Thus, if you have accidentally upgrade to firmware 2.2.1, there is no software-based unlock problem to unlock your iPhone 3G. But today, here is an answer you’re searching for.The 3G Fuzzyband Downgrader can be downloaded via Cydia (BigBoss source) and it is absolutely free. But make sure you’re using firmware 2.2.1, which is one of the requirements to use this downgrader. On top of that, the downgrader only supports Bootloader v5.8. Not sure what version of bootloader you’re running on? No worry. The downgrader application will automatically detect the baseband version for you.
The app is extremely simple and intuitive. What you have to do is to launch the downgrader and tap the “Downgrade” button. It’ll then verify your bootloader version and proceed with the downgrade.
Once you have the baseband downgraded, you can use Yellowsn0w to unlock your iPhone 3G 2,2,1 firmware. I still have to warn you: Use it at your own risk and make sure you only run the app on iPhone 2.2.1.
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