So I have a 3GS and previously jailbroke to 3.1.2 with PwnageTool probably a year+ ago now. My phone still has the original 4.26 bootrom and everything went totally smooth with my initial jailbreak process. Recently I've run into issues where some new apps need 4.0 or above to run so I think it's time to upgrade my f/w. Just want to confirm with the experts here with the best way to do so. I've read about Greenpois0n, but it seems there's now a reliable jailbreak solution with PwnageTool where I can upgrade to 4.2.1 f/w with PwnageTool 4.2 Is there any reason why I shouldn't use this method? Is there a better way?