Just got the vortex 150 and maddened it tonight. With the 4 cell it was too much for me in a gym. My other quads I arm with a switch on the transmitter and I prefer that to move the throttle to bottom left or bottom right for arming or disarming. How do I change this? If i have to do this via computer and Vortex Companion app why do I have problems trying to open a serial port?