What is a suggested way of updating BIOS firmware?

See the title.

Usually BIOS vendor (take thinkpad as an example) provide 3 ways to update BIOS: a Windows executable, a Linux executable, and an ISO image.

Windows executable is not suggested in Qubes OS since it needs dual boot Windows; Linux executable targets distribution like Ubuntu.

Is there a suggested way to update the BIOS firmware when needed on Qubes OS?

This is kinda difficult to do this, but you need to download the bios firmware files as ISO then use the DD command to do this. However, balena etcher was way faster than DD. This is up to you.