yep that is the correct firmware, don't worry about the qa flag for now. try the rex cobra first, then try qa flag again. if that still doesn't work, you don't HAVE to do it but its recommended, you would have to use the 999 downgrader go back to 3.55.4 then enable qa flag, then i think you can go back to rebug 4.70.1 somone else feel free the chime in. I think the QA might work once you are on rebug rex though.