Downgrade Your 3G Baseband - pHaseBanDowngrader

This new product for iPhone 3G will allow you to downgrade your baseband from 02.30.03 to 02.28.00 based on GeoHot’s method. Previously, those of you that upgraded to 2.2.1 could not use YellowSn0w. But now you can! iPhone 3G users can now upgrade from 2.2 to 2.2.1 and have it unlocked. Make sure you are on 2.2.1 firmware before trying this. I don’t recommend doing this, it still is pretty unstable and you need to know what you are doing. So please unless you have got some time don’t try this.

Please read the following, which was written by thebigboss source a few days ago on what they have learned about doing this and some of the problems in doing it. I haven’t tried this because I have iPhone 2G, but a lot of people have told me it works great.

Many guys from irc.osx86.org had tested it and they are loving the downgraded iPhone. To use that tool, you need to have an iPhone with the Bootloader 5.8. If your iPhone was manufactured before September 2008, you are 5.8. If your device is 2.2.1 OOB (Out Of Box), you can’t downgrade the Baseband because you have bootloader 5.9.

Instructions:

1. Download this zip folder which can be found here
2. SSH into your iPhone and put the downloaded folder (phasebandowngrader) inside the folder /Applications/
3. In MobileTerminal.app, type “login” and enter “root” as user, the default password is “alpine”.
4. Now, type “cd /Applications/phasebandowngrader && ./phasebandowngrader”.
5. Follow the screen instructions.