iOS 4.3 beta is jailbreakable as the unofficial PwnageTool version released is capable of creating the custom iOS 4.3 firmware. The unofficial version of PwnageTool is based on Geohot’s Limerain exploit.
However, famous jailbreak blog site is reporting that the end result is not desirable and better wait for the iPhone dev team to release the official version. At least it shows that the iOS 4.3 jailbreak will not be very difficult to achieve.
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