How do I jailbreak or unlock or downgrade an iPhone 3GS on 3.1.3 with

terryshanks45

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the latest boot & no cydia backup? I would like to either unlock it for use with t-mobile or jailbreak it so it is at least usable or even downgrade it so it can be unlocked. I have had little luck searching on the internet. This is an iPhone 3GS running apples 3.1.3 software, it has the latest boot & i can't do the shsh cydia method because the phone is locked and unjailbroken. I have tried to restore the firmwire to a 3.1.2 firmwire but itunes says that it is "unable to receive this update" or "ineligable for update" Any help is greatly appreciated!!
 
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