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there's a lot of confusion in this thread. it is possible to jailbreak 3.1.3.
it is also possible to unlock certain 3G with the old bootrom even if you accidentally updated.
if you wanna unlock your iPhone 3G on 3.1.3 and it has the old bootrom then just jailbreak it and using WiFi download "fuzzyband" in cydia, it will down grade your baseband and your phone will be ready for ultrasn0w.
it is also possible to unlock certain 3G with the old bootrom even if you accidentally updated.
if you wanna unlock your iPhone 3G on 3.1.3 and it has the old bootrom then just jailbreak it and using WiFi download "fuzzyband" in cydia, it will down grade your baseband and your phone will be ready for ultrasn0w.