BIOS mod for ASUS C90S for 1066Mhz Wolfdale?

**colombodk** · 02-08-2009, 09:49 AM

Does anyone know if anyone can mod the BIOS for ASUS C90S to enable 1066Mhz FSB Wolfdale (45nm) CPUs, e.g E7200, E7300, E7400...

If I were to mod the BIOS myself, which tools are needed to inject CPU-ids for 45nm CPUs?

If installing a E7300 ES with latest 1002 BIOS gives "CPU microcode load error" on POST... the CPU is correctly identified, but CPU microcode error halts the boot process... any advice would be appreciated?

If an experienced bios modder is willing to try to mod the latest bios to include 1066Mhz Wolfdale support I am willing to test the bios in my C90S...

**colombodk** · 02-09-2009, 02:01 PM

I was able to find the right tools to inject an updated CPU-list extracted from the AsRock Conroe945-DVI beta BIOS 1.91 available from a German website.

The updated CPU list is injected into and replaces the CPU-list in the standard Asus BIOS 1002. I then boot with a flash-usb drive with the modded bios named c90s.rom in the root of the drive. Power up and press ALT+F2 to start auto-recovery flashing using EZ-flash which will search optical and USB-drives for a bios file (c90s.rom).

Reboot, enter BIOS, load setup defaults, save.

Tested working with E5200 and E7300 ES.

PM me for a copy of the updated BIOS, I call it 1003.