I've changed stock TX/RX with a Spektrum just yesterday. On Naza Assistants all seems OK, I can see controls moving correctly when I move controls on my TX. I had an issue though, I am not able to start the engines, I am using all the combinations that should generate a engine start without success. Phantom is starting up correctly. When I try to start engines I always have a double flash, green if I am on GPS and yellow if I am on Atti-GPS. I've checked the manual and double flashes means that the sticks are not centered. Of course they are not since I am trying to start my engines with the different combinations. I am really stuck. Anybody has experienced a similar problem that could give me some directions.