Downgarde iPhone 4 Baseband 2.10.04 to 01.59.00 Coming Soon !
Good News, We know that iPhone Dev-team is working on two important tasks, untethered jailbreak for iOS 4.2.1 on all iDevices and iPhone 4 baseband 2.10.04 unlock. MuscleNerd has replied via his twitter to someone who asked him about the capability of downgrading iPhone 4, Let's check out how MuscleNerd replied him.
" mfaizulislam asking: for Baseband downgrade , can it be applied to iPh4 ?
MuscleNerd replying: conceptually, yep probably. But new i4 unlock must precede that because otherwise, nothing to downgrade from 01.59 to"
So, the dev-team is working now on downgrading iPhone 4 baseband 2.10.04 to 01.59.00 which is unlockable using ultrasn0w, but it should be known, that it has not been confirmed the success of this idea so far.
Copied from Downgarde iPhone 4 Baseband 2.10.04 to 01.59.00 Coming Soon ! » Iphone Unlock Jailbreak Downloads Activate Hack Tools Application Games - Iphone Downloads For You