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Usually it is supplied by the motherboard manufacturer and
is available from their website. Along with the latest
version of the BIOS for the motherboard in a file, usually xxx.BIN although it may be called something else.
However in almost every case they will advise you to boot into DOS and run their loader program to flash/update the BIOS.
One way to do it:
Copy their loader and BIOS update to a blank floppy.
Make sure that your BIOS is set to boot from A: first.
Put in a bootable DOS diskette in Drive A: and boot.
Swap out the DOS diskette, put in the BIOS update disk
and run the update program.
If you don't have a DOS disk this is how you can make one:
Download this program DOS622.EXE
Put a formatted floppy in the A: drive.
Run the downloaded program
You now have a bootable DOS diskette.
It's also a good idea to read any instructions on the manufacturers website.