X220s problems with flight controller

Hi Alex yes I’ve tried both suggestions but neither are working. Blheli wouldn’t even recognise it even when the fc leds was still lighting up. I’ve somehow fried 2 boards in 1 week. May i please drop it in for repair. I feel it would be better to have the work done than end up with an even bigger pile of broken flight controllers. I am driving through milton keynes today. So it would be easy for me to drop it off
Thank you