The only tools currently able to jailbreak iOS 4.3.x are PwnageTool and sn0wbreeze, and while the jailbreaks work just fine, they are tethered, and require users to connect their devices to their computers every time they need to reboot them, or every time their devices run out of battery. Things are about to change, though, as a new video posted on YouTube earlier today shows a jailbroken fourth generation iPod touch running iOS 4.3.1 with an untethered jailbreak. Do not rejoice too quickly, as the author, Stefan Esser (also known as xpl0n1c), did not build a jailbreak, but instead found an exploit that can be used to build an untethered jailbreak compatible with iOS 4.3.1. Esser offers more details about his method in the description alongside the video:
a. I repeatedly stated that I will not release a jailbreak tool – I will only give out the untether. I did not try yet, but if it is feasible the untether could be a cydia package. b. While the vulnerability I use is in the iPad 2 kernel my untether will NOT SUPPORT the iPad 2, because there is no way to install it there (bootrom exploits fixed). – however Comex is working on that part. c. I am not giving out any ETA again, because the Jailbreak community is simply nuts. Last time I gave an ETA and even before that had passed I got constantly insulted by people that were demanding an immediate release. Sorry guys the more you insult people with the knowledge to actually do what YOU WANT the less motivation there is to use our free time to give it to you. d. The only reason why I did not finish the untether before the ETA was due to unexpected work overload in my real job. It had nothing todo with the untether being too hard or unreal e. I don’t know why the dev team has not released a redsn0w that does tethered jailbreak for 4.3.1 – I would prefer that to be available, cause sn0wbreeze obviously does not work 100% yet.To build the jailbreak, the author simply patched sn0wbreeze to add his exploit to the tool. While the video could be a fake, it looks legitimate, as the iPod featured in the video is able to run Cydia, and doesn’t need to be tethered to boot. Also worth noting, while Esser’s exploit will most likely be used by several iPhone, iPod touch and first generation iPad jailbreaks, the method will not be compatible with the iPad 2, as the device’s bootrom seems immune to it. For some unknown reason, Apple is apparently paying special attention to all iPad 2 related jailbreaks: for instance, Comex confirmed earlier today that his recently uncovered userland exploit has been patched in iOS 4.3.1, even though the method has not been used in any jailbreak tool just yet.