The iPhone Dev Team have released two quick updates to RedSn0w since we last reported on the multipurpose jailbreak tool. According to the Dev Team’s blog, version 0.9.11b3 was released to fix random “restore failed” messages and version 0.9.11b4 fully supports tethered jailbreak of A4 devices (1st gen iPad, iPhone 4, 4th gen iPod Touch) which adds SHSH “stitching” support for iOS 5.1.1 as well as “custom” NO_BB IPSWs for unlockers.
You can download the latest version of RedSn0w from one of the direct download links below:
Download RedSn0w version 0.9.11b4 for Windows.
Download RedSn0w version 0.9.11b4 for Mac OSX.
You can find jailbreak instructions here, and its the same process as for iOS 5.0.