As expected, the iPhone Dev-Team has finally released the untethered jailbreak for iOS 4.3.1 via Redsn0w 0.9.6 RC9 and PwnageTool 4.3. Except for the iPad 2, this new untethered jailbreak is compatible with all devices, including: iPhone 4, 3GS, iPad (1st-gen) and iPod touch 3G/4G on iOS 4.3.1 firmware. The untethered jailbreak for iOS 4.3.1 is based on an exploit found by iPhone security expert and hacker Stefan Esser, who demoed it on his iPod touch last week before handing it over to the Dev-Team. iOS 4.3.1 was originally jailbroken last week using PwnageTool bundles (on Mac) and Sn0wbreeze (on Windows) but it was limited to tethered boot. But now with this new version of Redsn0w 0.9.6 RC9 and PwnageTool 4.3, you can jailbreak on the above mentioned devices, fully untethered on iOS 4.3.1. Ultrasn0w unlockers MUST stay away as Ultrasn0w is not compatible with iOS 4.3.1. However, the iPhone Dev team is hard at work to fix it. The 4.3.1 untether exploit comes courtesy of Stefan Esser (@i0n1c on twitter), a security researcher based in Germany.  Stefan has a long history of vulnerability research, and ironically his first contribution to the iPhone jailbreak community was improved security – last year he beat Apple to the punch and implemented ASLR for jailbroken iPhones with his “antid0te” framework. We’re happy to see that Stefan then turned his iPhone attention over to an untethered jailbreak exploit! The reason the untether won’t work as-is on the iPad2 is that it requires a bootrom or iBoot-level exploit to install, and the iPad2 is not susceptible to either the limera1n or SHAtter bootrom exploits. WARNING WARNING — ultrasn0w users don’t update yet! We need to first release an update to ultrasn0w that fixes some incompatibilities when FW 4.3.1 is used on the older basebands supported by ultrasn0w.  And remember once we do fix ultrasn0w for 4.3.1 (we’ll announce it here and on twitter), you must only get there via a custom IPSW from PwnageTool, Sn0wbreeze or xpwn!  Don’t ever try to restore or update to a stock IPSW, or you’ll lose the unlock! With Redsn0w you can jailbreak your device without the need for a restore. It is simpler to use than PwnageTool. If your device is currently jailbroken with one of the previous betas, please do a fresh restore first. Download Redsn0w 0.9.6rc9 for Mac OS [Direct Link] Download Redsn0w 0.9.6rc9 for Windows [Direct Link] Download iOS 4.3.1 for iPhone, iPad, iPod touch and Apple TV 2G Download and install the latest version of iTunes. You may also like to read: We will update you on the topic as more information is available, stay tuned by following us on Facebook, Twitter and/or by subscribing to our RSS Feed. Update: Authors:

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