how can i update this motherboard BIOS without a cpu? MSI X99A RAIDER

Solution
You can't do any processing without a CPU and updating the BIOS is processing. So make sure the motherboard you buy has a p.3 or later bios when you buy it. If you can't do that, look at other motherboards.

MonsterMMORPG

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Does bios version write anywhere on the package?

And I found that Asus supports flash without cpu why msi not?