Asus PS4 - Manual (Page 68)

5-4 Chapter 5: BIOS setup
4. The utility verifies the file, then starts updating the BIOS file.
DO NOT shut down or reset the system while updating the BIOS to prevent
system boot failure!
ASUSTek BIOS Update for DOS V1.06 (09/08/04)
Current ROM Update ROM
Note
Writing BIOS:
FLASH TYPE: MXIC 25L1605A
PATH:
BOARD: KGNE-D16
VER: 0201
DATE: 04/30/2010
BOARD: KGNE-D16
VER: 0202
DATE: 05/21/2010
5. The utility returns to the DOS prompt after the BIOS update process is
completed. Reboot the system from the hard disk drive.
The BIOS update is finished! Please restart your system.
C:\>
WARNING! Do not turn off power during flash BIOS