Hi mate. Basically, I've got 2 quads that I'm building. Both exactly the same setup(frame, motors, esc's etc). I flashed them both and installed the latest firmware like the video says. But on one fcb everything works but motor 4 doesn't respond, so I changed both esc and motor still nothing so I know it's not that. And on the other fcb it won't recognise the transmitter properly. The throttle will not work.