A new group of hackers “UnthreadedJB” has released a tool with the name UnthreadedJB that brings solution of untethered jailbreak for iPhone 4 CDMA model which is running over iOS 5.1.
Although UnthreadedJB is the first untethered jailbreak tool for iOS 5.1 but it only works for iPhone 4 CDMA, whereas previously released jailbreak tools like Absinthe 2.0 is also untethered works for iOS 5.1.1 and RedSn0w is a tethered iOS jailbreak solution.
Now, if you have iPhone 4 CDMA model running over an year old iOS 5.1 and you wish to perform untethered jailbreak then you must go for UnthreadedJB tool to do so, only through Linux.
Download UnthreadedJB for iPhone 4 CDMA