Lenovo Tiny M73

I had this running Catalina, then tried upgrading to Big Sur which kind of worked, wifi did not work.

Decided to reinstall Catalina and for some reason now I can't

No matter what I do, I cannot boot off the USB flash drive.

I reset the BIOS using the jumpers on the motherboard, rest to defaults in the BIOS a dozen times or more, nothing I do can get it to boot to the USB flash drive which I know works, I have used it to boot on another computer and it worked fine.

I am really at a loss as to what to do next.

submitted by /u/datahoarderguy70
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