Ok i need you to try something for me , but it will involve you doing a few things first.
firstly download this version
https://blackcatusb.net/index.php?threads/official-fcusb-rc20-build-464-classic.449/
Once you have that downloaded use build 512 to downgrade the firmware to the version inside that build , once that is done then you will need to uninstall the current driver for fcusb and install the driver this version uses , it should then come up under WinUSB device.
Once that is done use build 464 to program the motherboard and tell me if you get the same errors