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While Apple is currently seeding out iOS 4.3 beta builds to developers, the Chronic Dev Team has released untethered jailbreak for iOS 4.2.1 running devices. Available at http://www.greenpois0n.com, the jailbreak tool is meant for Mac OS X platform at this moment and a Windows version is promised soon. The new greenpois0n tool allows jailbreaking iOS devices like iPhone, iPad and iPod touch running the iOS 4.2.1 update. The process is easy and jailbreaks your device in a few clicks. However, iPhone 4 owners need to avoid this tool as it doesn't perform carrier unlock and updates baseband firmware. This means you won't be able use any custom micro SIM.

Chronic Dev Team's Greenpois0n released candidate 5 jailbreaks for iPhone, iPod touch and iPad. One of the team members Joshua Hill aka p0sixninja, stated in a Twitter update that the exploit used so far for device jailbreak has been patched in the iOS 4.3 beta builds. So, all those who care about jailbreaking their iPad, iPhone and iPod touch might be asked to stay away from iOS 4.3 update when it arrives.

New Greenpois0n tool for Mac OS X enables untethered jailbreak which means you won t have to jailbreak your device every time you want to restart it or it runs out of battery. Just plug your device to Mac, perform a clean iOS 4.2.1 restore and then jailbreak it using Greenpois0n tool. After the device restarts, tap on the Loader app and let it do the needful. Just in case you can't get Cydia package manager working, you can use redsn0w 0.9.7 to install it by unchecking rest of the options.

At this moment, greenpois0n.com is undergoing some trouble because when I tried to download the jailbreak tool, it gave me a very small archive with nothing inside it. So wait till it is fixed and then try downloading the tool. Many stated that the jailbreak doesn't work for them. Once again, I'll point out that you'll have to perform a clean iOS 4.2.1 firmware restore on your device before executing the jailbreak.