Unknown CPU detected, Bios Update is Required to Unleash it's Full Power

Question

I have a Asus P5K SE motherboard and I recently changed the CPU from a Core 2 Quad to a Core 2 Duo. After the change a message displayed at the very beginning of the boot:

Unknown CPU detected, Bios update is required to unleash it's full power. The system will shutdown after 25 seconds.

I believe this indicated that I must perform a BIOS update. The problem is that I cannot boot. Not into windows, nor to CDROM or anything else. It is not even letting me to enter the BIOS setup.

How do I flash the BIOS without being able boot from anything?

Thread UPDATE: I was able to flash the latest BIOSs without changing the CPU using the integrated ASUS flash tool; after flashing the BIOS successfully and rebooting I got rid from the CPU message; instead I got this message. I removed all the USB devices, and the front USB wires, and placed the motherboard on a non metal surface but still have this USB message, any ideas?

Solution

Answering this since it is an unswered question since may 2015 and hence will pop to the front page now and them.

• Either revert to the old CPU and update from a fully working system,
• or use the integrated ASUS flash tool

Comments

[ta.speot.is]

Unleash the Core 2 Quad back into the motherboard, unleash the BIOS update, unleash the Core 2 Duo.

[Jonny Wright]

Have you tried entering the BOIS since flashing the new version? Are you sure the version you flashed was for your make /model of motherboard? Sounds like it may not have flashed properly

[Alexander]

no i cant enter the BIOS after flashing , yes it was for that model and from asus site , i had watched a youtube tut and the flash tool graved me o error messages

[Daniel B]

He already successfully updated, though. ;)

[ganesh]

True. But it will get popping up and up until it receives an accepted answer. (andif the OP posts his or her answer and accept it then I will be glad).