even you were in iOs 4.0 you could still downgrade it to FW 3.1.3 after you've manage to downgrade it you can now unlock it
usings this tools
Follow Step By Step in Pics
now jailbreak it using spirit
Then Unlock With Ultrasn0w
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ou are now running in version 3.1.3 w/ Modem firmware 5.13
I repeat this is only for those who have updated their iphone 3gs to iOS 4.0
I repeat this is only for those who have updated their iphone 3gs to iOS 4.0
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