The iPhone-Dev crew has updated the Redsn0w tool so that it’s fully iOS 6 compatible, and has an official Cydia app. Previously, the iOS 6 jailbreak was only for developers, so Cydia didn’t install automatically when an iOS 6 device was jailbroken. However, it’s now ready for the public.
iPhone & iPod iOS 6 jailbreak now available to public (untethered & tethered)
As well as iOS 6 support, Redsn0w 0.9.15b1 has support for downgrading and restoring some gadgets from iOS 6 to older firmware versions like iOS 5 (untethered).
Once you’ve done the update, Redsn0w can only do a tethered jailbreak on iOS 6 devices like the iPhone and iPod Touc, so if you don’t want to plug your device into your computer each time you boot up, you can either stay at iOS 5 or use iOS 6 without a jailbreak.
If you’re not bothered about tethering, then these are the devices that can use Redsn0w’s new release: iPhone 4, iPhone 3GB and iPod Touch (4th gen)
All A5, A5x and A6-running devices (the iPhone 4S, iPhone 5, 5th-gen iPod Touch and the 2nd and 3rd-gen iPads) aren’t supported just yet.
Unlike Redsn0w’s previous release, you don’t need to find the iOS 6 IPSW file. This new release finds the firmware on your device, downloads the necessary file and then does its stuff. Don’t forget, you’ll also get Cydia with this!