@LaCorb That is the correct method (the reset button) for that board (make sure you are shutdown when you try). Any BIOS you try to flash must be named correctly and it must be in the root of the usb - no other files on the stick. From what you have described (4 flashes, then solid) the flash is failing and the most common causes are the file has the incorrect name and/or is not in the root of the drive.