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.
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