m8 as the post above had said there is no coming back down from 6.15 if you read up on all this before you unlocked the phone you would have seeing that, how i did see somthing some where this could be done with a mac pc dont know if in works as i dont have one
Iphone 3gs baseband 6.15
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if not press the green tab to tell me to f**Koff 

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