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...New BootRom/BootLoader? My Iphone Black 3GS 32GB has Serial #88925J403NR,is it the Old BootRom/BootLoader or New BootRom/BootLoader? it has been jailbroken on 3.1.3 and unlocked using Spirit Jailbreak, has it any chance of upgrading to iOS4 from 3.1.3 still un-tethered jailbroken & unlocked...