Hello friends. I have constructed the following items: DJI F450 quad frame, 4 X 960kV motors, 4 X 30A ESC, Here satellite receiver, Spektrum DX9 transmitter, AR8010T receiver, Pixhawk4 Cube flight controller. Using Mission Planner to configure the above assembly, I have successfully set all the components but can not ARM the system. Pre-flight checks are all OK. Transmitter controls are being accepted. GPS locks are OK. Up to 10 satellites are being registered. I have changed the internal safety parameters several times but can not ARM the system. Does anyone have any suggestions to overcome this problem?