Try using QGroundControl to flash Ardcopter. Select Chibios, Stable version and Cube Black. If succesful you can then go back to Mission Planner for Config anf Calibration.
Hi. I didn’t try the QGroundControl first. I tried using Mission Planner and the firmware did load. Com port recognized message was coming in the end. But every time I try connecting it to Mission Planner, first solid red light emits then red light blinks. Afterwards red blinking light stops but solid red light red light remains.