The BIOS loads before the OS... the latest BIOS is the same for all.
Best to update BIOS from within BIOS.... how to do that is explained in the forum here. You can search that out if you wish... unpack the SP, get the .bin file from the SWSetup folder in the DOS folder on root C, and put that on the top level of a USB thumb drive. Cold boot with that in place, navigate into BIOS first tab and you'll see the option to update BIOS from the thumb drive.