The new iPhone 3.1.3 firmware wrecks any previous unlocking or jailbreaking efforts, warns the unofficial iPhone Dev Team. Both the PwnageTool and redsn0w tools are noted to be incompatible with v3.1.3, with the exception of the latter when jailbreaking a first-generation iPhone or Touch. In those cases, users can point the software to an existing v3.1.2 IPSW.
