Re: I'm curious -
Most modern operating systems (Windows, Linux, MacOS) load the microcode (and do the updates) automatically. This is done, every time the system restarts (volatile).
In theory, you can also update microcode from the BIOS/UEFI during boot. But, except for some odd cases, this is pointless. As previously stated, the operating system already does the trick. Therefore, what the BIOS does is irrelevant (and you can skip those updates).