I found that many people are facing the problem of not being able to download the motherboard BIOS. Go to Intel's official website and find that the old motherboard BIOS is gone. But I can still download it and have the BIOS you want on the Chinese website.
Which website? If not an Intel site, I do not recommend it. If it is an Intel site, provide the link.
These boards are discontinued and not supported. The files have been removed, as has been stated in the announcement on the Desktop Boards forum.