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We had reported couple of days back that iPhone hacking expert Stefan Esser who goes by the Twitter handle i0n1c had figured out a way to jailbreak iOS 4.3.1, which was untethered.
He had also handed over the the untethered iOS 4.3 jailbreak to iPhone Dev team so that they could test it before releasing it to users. MuscleNerd, one of the members of the iPhone Dev team has revealed that the untethered iOS 4.3.1 jailbreak is 'solid'.