The iPhone Dev-Team has updated RedSn0w to perform a tethered jailbreak of iOS 6 beta 3. Note this release is intended for developers only.
The "dev3" version covers today's 6.0beta3 release (and also adds explicit support for 6.0beta2). Please point redsn0w at the 6.0b3 IPSW in order to jailbreak beta3 and boot tethered.It’s worth noting that just as iOS 6 betas are meant for developers, so is jailbreaking them. This version of RedSn0w will not install Cydia, due to the fact that a number of packages have not been updated to support the new firmware.
If you are interested in downloading RedSn0w 0.9.13dev3 you can download it from the iJailbreak Downloads Section. Additionally you can use one of the download links below:
Download RedSn0w 0.9.13dev3 (OSX)
Download RedSn0w 0.9.13dev3 (Windows)