Neither. Only an embedded hardware detector on the mainboard can do the job with a high degree of confidence. Software can't. And that kind of mainboard isn't available yet.

>>>Can it access them and detect when there is a threat there?>>>

Probably not.

Read this thread: https://smallbusiness.chron.com/cleanse-virus-bios-79706.html

Is it possible to infect the bios? Yes, it is possible as I said in the previous topic. But this is very unlikely to happen as you need to have some kind of administrator access on your system. In addition, the uefi firmware has the secureboot feature, which operates before the operating system boots. In my opinion there is nothing wrong with your computer.

See this answer from another user: https://security.stackexchange.com/questions/206606/can-a-virus-destroy-the-bios-of-a-modern-computer

Modern computers don't have a BIOS, they have a UEFI. Updating the UEFI firmware from the running operating system is a standard procedure, so any malware which manages to get executed on the operating system with sufficient privileges could attempt to do the same. However, most UEFIs will not accept an update which isn't digitally signed by the manufacturer. That means it should not be possible to overwrite it with arbitrary code.

This, however, assumes that:

the mainboard manufacturers manage to keep their private keys secret

the UEFI doesn't have any unintended security vulnerabilities which allow overwriting it with arbitrary code or can otherwise be exploited to cause damage.

And those two assumptions do not necessarily hold.

Regarding leaked keys: if a UEFI signing key were to become known to the general public, then you can assume that there would be quite a lot of media reporting and hysterical patching going on. If you follow some IT news, you would likely see a lot of alarmist "If you have a [brand] mainboard UPDATE YOUR UEFI NOW!!!1111oneone" headlines. But another possibility is signing keys secretly leaked to state actors. So if your work might be interesting for industrial espionage, then this might also be a credible threat for you.

Regarding bugs: UEFIs gain more and more functionality which has more and more possibilities for hidden bugs. They also lack most of the internal security features you have after you have booted a "real" operating system.