
The iPhone Dev-Team has released PwnageTool 3.1.5 for Mac OS X which lets some iPhones upgrade safely to the 3.1.3 firmware.
Using PwnageTool to upgrade will preserve your jailbreak and ultrasn0w unlock. If you are using the blacksn0w unlock at baseband 05.11.07 you will need to stay at 3.1.2.
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iPhone 3GS users (regardless of unlock) should stay away from this and all 3.1.3 jailbreak tools unless you know you have your “SHSH hashes” backed up via Cydia. That’s because if you make a mistake you may find yourself stuck at official 3.1.3 with no way to jailbreak or come back down to 3.1.2 to jailbreak. Read more…






