Hi is Greenpois0n the only option for untethered 4.2.1 jailbreak using Windows? Does redsn0w or PwnageTool has a version out for Windows? I checked the iphone dev team page and it seems all available are for mac users. So if Greenpois0n the only option for Windows, how is it compared to the Dev Team's PwnageTool? Is there any downfall? Thanks very much for all the help.