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 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.

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.

Note that this latest releases still uses the 24Kpwn exploit to jailbreak, and therefore does NOT fix the tethering issue related to the latest iPhone with the new bootrom (stick with blackra1n tethered jailbreak at 3.1.2 for now!)

Visit here for more information and download mirrors.

Pwnage Tool 3.1.5

Jailbreak utility for iPhone/iPod and 3.1.3 OS.

This site was originally created for my own personal computer repair company, but I have recently decided to rebrand it as an online resource for *anything* computer related; from Macs to PCs, PlayStation to XBOX 360, iPods to iPhones — This site will be designed to house any kind of useful and relevent information pertaining to such.

So, if you’re thinking of creating a “hackintosh” from a PC,  jailbreaking your iPhone/iPod, or wanting to modify your XBOX 360 console, or even just want to read up on the latest trends in technology, then this is the site to visit!