We recently informed that posixninja the member of chronic dev-team tweeted that they are going to release new update of GreenPois0n which bring full untethered jailbreak to iOS 4.2.1 without needing 4.2b3 SHSH blobs and after some time they release a demo video running an untethered Jailbreak iPhone.

But we found a thing in video that Cydia is opening without having any connection, As shown in video there is no sim, no Wifi connection. When we ask to Posixninja he replied that it is bug and they are working on it will release the full package soon! Video is available check out the video by your self.