Hi I have a Flight Core that I am trying to update the firmware on (changing to Ardupilot) I have no issues through the USB port normally but when in bootloader mode it's as if the USB communication is just cut off. The green light is flashing as it should to indicate bootloader mode but when it does change to bootloader mode the USB connection just drops and I can't find anything in Device Manager. Are there any known issues or something obvious I'm missing?