Question Can I update the BIOS to a B450M DS3H V2 Mobo If I Have A Amd Ryzen 5 5600x CPU?

Well, they basically just aren't available on the cheap. AMD basically stopped making the cheap ones. Athlon 3000G is over $100.

You can try their loaner CPU program, not sure if it still applies to you:

https://www.amd.com/en/support/kb/faq/pa-100

At the bottom.

It seems they are doing it for B550 boards, not sure if they are still support older B450 boards. But they should, you bought the CPU at least recently.
 
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