Im using the apm 2.8, been trying for days to get it set up, seemed to work at first, but couldnt get the motors to arm, noticed on radio calibration the throttle seemed to be backwards, push stick up, green bar went down, push stick down green bar goes up, ive removed the software from my computer and reinstalled several times, even reset the board, now it wont even upload the firmware, wen selecting the comport it doesnt identify as arduino it just says "serial device", im running windows 10, any suggestions?