A friend of mine has a kindle fire hd 8.9 which he wants me to root and put a custom rom on. The problem is he doesn't have the fastboot cable anymore. I'm pretty sure I wouldn't screw up his device but I just want to be extra cautious since it's not a device I own. Now my wife has a 1st generation kindle fire with the original plug/charger so I was wondering if that fastboot cable would work just as well. Sorry about the dumb question I just want to make sure I have everything covered before I work on my friends kindle.