So I'm heading to a friends tonight and he has a computer. I figured since you never know, that it might be smart to create a solution in the unlikely chance that I need to reboot my JB'd 4.2.1 iPad. I put the correct .ipsw file along with Redsnow on a USB Flash Drive. This should be all I need, right? He has an iPhone so the data cable is there if I need it. Anything else I might not be thinking about?