iPhone Dev Team released Redsn0w 0.9.13dev3 for iOS 6 beta 3 jailbreak for developers. Remember its tethered jailbreak and its only for the Limera1n exploitable devices that can run iOS. These devices include iPhone 3GS, iPhone 4 and iPod Touch 4G. Download links are available at the end of the post.
Remember this is a developer version of Redsn0w. iOS 6 is also in its beta version. Kindly do not pirate Apple software if you are not a registered developer.
Download Redsn0w 0.9.13dev3 for Mac and Windows
How To Jailbreak iOS 6 beta 3 On iPhone, iPad and iPod Touch
Jailbreaking iOS 6 beta 3 is very similar to the jailbreaking iOS 6 beta 1 and 2. All you need to do is to follow the below guide but with updated Redsn0w links given above and iOS 6 beta 3.
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