After hours of getting bf to open I soldered my fc on. Then it would not arm.checked and rechecked against another quad. Finally I clicked the switch on the motor tab saying I'm aware. Before I only did that to calibrate the motors. Funny thing is every change and save in other tabs I have to go to motor tab to hit through slide switch. A little more assembly and this bird is back in the air. I got all my knowledge from this site and many hours at the drivers but when that sucker opens or flashes firmware gets a big hell ya. Go down to tell the wife and kids they say who cares that's stupid. For all of of usus hell ya