Asus Vintage - Manual (Page 62)

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4. Insert the floppy disk that contains the BIOS file. If the
P4S800-MX.ROM file is found in the floppy disk, EZ Flash performs
the BIOS update process and automatically reboots the system when
done.
DO NOT shut down or reset the system while updating the BIOS! Doing
so can cause system boot failure!
User recovery requested. Starting BIOS recovery...
Checking for floppy...
Floppy found!
Reading file “p4s800-mx”. Completed.
Start flashing...
Flashed successfully. Rebooting.