Just a quick reply from me
I will let the techs give a better answer.
But updating the BIOS fills me with terror!
One wrong move and the BIOS gets corrupted and you have a very heavy paper weight on your desk, so unless there was some overriding need to update it, I have always shied away from that. I have never had that overriding need.
True, I am told I can always revert the BIOS to default by removing the CMOS battery and/or shorting jumpers or such thing, but that is way over my head and capabilities.
If you are confident with such things, and if your system needs an updated BIOS, then go for it, (subject to what the experts say), but if this were me and the system was working as well as expected, then i personally would leave well alone.
There is a general thinking about this. If it works, don't fix it.
I hope that helps.