Here´s the complete list from Asus Bios updates posted on Asus which were released since 09/01/03. Click read more for the complete list Bios A7N8X-VM 1009 - 03 Beta Bios P4C800-E Deluxe 1011 Final (=1011 - 07 Beta) Bios P4C800 Deluxe 1011 Final (=1011 - 07 Beta) Bios P4C800 1011 Final (=1011- 07 Beta) Bios PU-DL 1006 Final (=1006- 02 Beta) Bios PU-DLS 1006 Final (=1006- 02 Beta) Bios P4S800 1005 - 04 Beta Bios PC-DL 1002 Final Bios P4P800 (Standard / Deluxe) 1010 Final (=1010 - 06 Beta) Make shure that the bios fits to your motherboard and only flash when necessary.
Get more informations about your motherboard at the above shown Asus link.