ASUS P2B-S

BIOS 1012

http://chessrank.altervista.org/bios/bx2s1012.zip

Description: Added microcode update support for Coppermine B-0 stepping.

File Size: 192364 Bytes.

Validated since PCB: 1.04*

Validated since BIOS: 1013.004 

Note the later shipment of the same PCB version

If your motherboard BIOS version number is greater than the BIOS version listed above, then you will not need to flash your BIOS. However, if your BIOS version is smaller than the version listed above, then you will need to select and download the latest BIOS to update your system. 

Url: https://www.asus.com/supportonly/p2b-s/helpdesk_cpu/