Redsn0w is a cross-platform jailbreaking, unlocking, and customizing tool for iPhone and iPod Touch. New version redsn0w 0.9b3 supports the latest firmware 3.1.2. The most recent release before this one was redsn0w 0.8, which targeted Apple firmware 3.0/3.0.1.
redsn0w 0.9 beta3 supports:
All iPhones and iPod touches except the iPod touch 3G
Windows and Mac OSX (x86)
Apple firmwares 3.0-3.1.2
When it’s out of beta, it will support the iPod touch 3G, PPC OSX, and Linux.
If you need a carrier unlock, redsn0w will handle iPhone 2G by itself (by installing the BootNeuter utility). For the iPhone 3G and iPhone 3GS use Cydia after you’re jailbroken to install ultrasn0w (baseband 04.26) or blacksn0w (baseband 05.11).
If you have a late-model iPhone 3GS, or if you have an iPod touch 2G whose serial number begins with “MC” (newer than week 40 of last year), you can use redsn0w to jailbreak but you are currently restricted to “tethered” rebooting. That means you need to connect your device to a computer each time you boot it – so just try no to reboot.
And after the various Key and provocations made by GeoHotz, the DevTeam has decided to write a new article on the official blog with good news for all owners of an iPhone 3GS! The DevTeam has verified that the exploit called 24Kpwn (used for the first time to unlock the iPod Touch 2G) is still valid and it works wonderfully for iPhone 3GS.
It seems the new version of bootrom used by Apple in 3GS dates back in August, a few months before the release of 24Kpwn, so there was no time to solve the problem.
In addition, the new daemon released by the team under the name of ultrasn0w (unlock for iPhone 3G) will work with iPhone 3GS.
New versions of redsn0w (jailbreak) and ultrasn0w (unlock) with iPhone 3GS support will be released soon.
