I have connected flight controller through usb, Activity light was flashing. Then i connected to the clean flight and went on the kitchen to make a cup tea without disconecting. When I'm back the board stop flashing completely through a usb port, but once I attached the battery, everything starts work fine, but no response through usb port alone, seem to be no power going in, or what is wrong with these boards? I bet everybody having difficulties with special racing f3 mini. What do you suggest? Any additional information would be helpful on how to reload.
I already have 2 of them, one was factory damaged and the other lost communication with USB.
It's just odd that one worked perfect and the other doesn't.