OK give me some details here what model is your phone? 3Gs, iPhone 4. As far as I know the way Redsn0w works is you connect to iTunes and upgrade your phone to 4.3.1 then after the update you shut down iTunes and run Redsn0w and point to the ipsw that you downloaded. Then Redsn0w patches the firmware and loads it onto your phone through DFU mode. So I'm not sure which method you're trying to do so once you give me the info I can look it up for ya and get it straightened out.