flight test builds

Hi everyone I’m Bradley mixon first time posting on a thread ever. I’ve been watching flight test for about 6 months now and it has inspired me to get into the hobby of flying RC planes my first purchase was a electric brushless carbon cub s rtf from horizon hobby and even tho it was my first...

can somebody help me? I decided for my first quad build was to build an FT gremlin but when I tried to flash the board, the computer wouldn't read it. Without the two pads being shorted the board works fine but if its shorted, the light comes on but the computer doesn't read it. anybody know how...