iPhone 3g with 3.1.2, but with firmware 5.12.01. Will I be able to downgrade Baseband?

Peter

New member
I was recently requested to unlock an iphone. The iphone I was given is an iPhone 3g and its currently on Firmware 3.1.2 but its baseband is 5.12.01 Will I be able to downgrade the baseband in anyways as well as unlock it in its current state?
 
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