If you accidentally updated your iPhone 4 to 4.2.1 and lost your unlock, you’re in luck! There is now a way to downgrade iPhone baseband 03.10.01 to 01-59.00 in a few simple steps thanks to AssistantBDowngrade, an application available through Cydia.
Please note that this only works with the iPhone 4 on OS 4.2.1 with baseband 03.10.01 and the older bootloader. Let me repeat this so it’s clear. This trick will only work for iPhone 4 4.2.1 baseband 03.10.01 with bootlloader .
via how to downgrade 03.10.01 to 01.59.00
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