Unlock iphone 3gs, unknown ios version or baseband

I

iMore Question

My 3gs was jailbroken and unlocked. Since i wasn't using it anymore, i lent it to a friend who thought it was a good idea to update the phone without asking me. It is stuck on activation screen. I don't know to what version it updated. I have tried using redsn0w but no luck, maybe i'm doing something wrong. Thanks in advance!
 

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