[digg-me]Since firmware 2.2.1 came out and updated the baseband from 2.28.00 to 2.30.03, many people accidentally updated, and are now stuck on baseband 2.30.03. I wonder how you can “accidentally update” your firmware as it takes a few steps, but anyways… I’ve had a few emails from people asking me how to downgrade baseband 2.30.03 to 2.28.08.
If you’re looking to unlock your iPhone with YellowSn0w, you can’t do that as long as you will on baseband 2.30.03. Unfortunately, you can not downgrade baseband 2.30.03 to 2.28.00! Sorry folks but you should have read the Dev Team’s warning!
Now the good news is that I’m very confident the Dev Team is working on updating YellowSn0w so it works with firmware 2.2.1, baseband 2.30.03.
You can still downgrade your firmware from 2.2.1 to 2.2 in iTunes by hitting SHIFT + RESTORE and selecting firmware 2.2 but you will most likely have errors and even if you manage to downgrade, you still won’t be able to downgrade the baseband.
UPDATE: It’s now possible to downgrade your baseband thanks to pHaseBanDowngrader
pH (Pedro Henrique Franceschi) created a tool to help you downgrade your baseband from 2.30.03 to 2.28.00. To use this tool, you have to have to have an iPhone with bootloader 5.8. If your iPhone was manufactured before September 2008, you’re good. If you bought your iPhone after September 2008 with firmware 2.2.1 out of the box, then you can’t use pHaseBanDowngrader because your bootloader is 5.9.
Here are the instructions on how to downgrade using pHaseBanDowngrader:
1. Download this file
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”. Follow the screen instructions
Again, a big Thank You to pH for developing this tool.