Hello, I have the same transmitter, if you are using the stock firmware, make sure you use a airplane model instead of a Heli for testing. Remove all aux channels configured on the transmitter to make the test. one more test, make sure you disable the pwm receiver on the hardware tab. (if you have stock firmware, and you want to use 3 flight modes, ask me later I can give you the instructions, I found a workaround although you find in all forums it isn't possible!