p0sixspwn—the jailbreak tool created by the tandem of iH8sn0w and new Apple employee Winocm—has been updated to support the just-released iOS 6.1.6 for an untethered jailbreak. iOS 6.1.6 was released solely for the iPhone 3GS and the iPod touch 4th generation. The firmware update was pushed out as a part of Apple's SSL security fix, which also ushered in iOS 7.0.6 for more recent devices.
If you're currently using an iPhone 3GS or a 4th generation iPod touch running iOS 6.1.x, it's highly recommended that you update to iOS 6.1.6, and benefit from Apple's SSL fix. The good news is that you can then use p0sixspwn to enjoy the same untethered jailbreak that was available for iOS 6.1.3 through iOS 6.1.5.
p0sixspwn, the jailbreak tool for iOS devices running iOS 6.1.3 through iOS 6.1.5, has been updated for Windows users. Originally released exclusively for the Mac, p0sixspwn makes jailbreaking possible for those who wish to remain on older firmware, or for those who can't upgrade for whatever reason.
The jailbreak tool is the result of a collaboration between iH8sn0w, winocm, and SquiffyPwn. You can find the download links to the Windows version and the latest version for OS X inside.
For those that missed it this morning, p0sixspwn was updated to fix a few major bugs from the previous release. The untethered jailbreak, released for devices on iOS 6.1.3-6.1.5 by winocm and iH8Sn0w, should no longer create issues with iMessage or LTE.
Interestingly enough, the update also adds support for the Apple TV 2 (still no Apple TV 3). So while I don't think you can use it to directly jailbreak the set-top box, it shouldn't be too long before a utility like Seas0nPass takes advantage of the new capability...