BIOS are separate systems from the OS, so don’t really synchronize with them. The BIOS is super basic, hence the name, so tends to run on only the bare bones of a computer. You can think of the BIOS as just being there to start things *before* the OS takes over and does more complex stuff, like displaying nice graphics.
I guess an analogy would be winding up a clock. The winding mechanism is like the BIOS, it just starts the system of dozens of gears and weights and springs used to keep time. The winding mechanism isn’t the thing keeping time, it’s just a simple gear and lever, but without it the rest of the clock can’t even begin to function. You can even put a new clock on the winding mechanism and it will run the new clock, just as you can put a new OS on top of the BIOS. Sure, the winding/BIOS won’t match the new stuff, but who cares? If you see it it’ll only be once every long while, you’ll be using the clock face/OS most of the time.
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