How to upgrade iphone 3g on 3.1.2 firmware (unlocked w/ tmobile) to firmware 4.0.1?

Christian

New member
I have an iphone 3g 8gb unlocked with blackrain for t mobile running on 3.1.2 and i was wondering if there was a way to upgrade to 4.0.1 without losing my unlock (or updating the baseband) thanks.
 
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