Dev-Team today released a new and updated version of PwnageTool. The new version is PwnageTool 3.1.5, and is able to crack the iPhone OS version 3.1.3. Here’s a take from the Dev-Team Blog:

On Tuesday, Apple released firmware 3.1.3 for the iPhone and iPod touches.  Unless you’ve personally observed a problem with the reporting of your battery percentage, there’s no reason to update to 3.1.3.  We know some of you will want to anyway.  Superbowl Sunday’s PwnageTool 3.1.5 for Mac OS X will let you do so safely, preserving your jailbreak and ultrasn0w unlock.  (If you use the blacksn0w unlock (at baseband 05.11.07), you need to stay at 3.1.2.)

iPhone 3G and 3GS unlockers should always be very wary to update their firmware.  This is no exception.  If you make a mistake along the way you may find yourself updating to official 3.1.3 in which case you will lose your unlock, possibly forever.

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.

If you really truly feel that you need to update, this version creates a custom 3.1.3 IPSW for you to restore to on your iPhone 2G, iPhone 3G, iPhone 3GS with early bootrom, iPod touch 1G, and iPod touch 2G with early bootrom.  If you don’t know if you have an early bootrom or not, please avoid updating until you learn more.

To download this, head over to the Dev-Team blog here.