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I have Asus P5K SE motherboard and I recently change the CPU from a core2quad to a core2duo. After the change i got a message 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 that i must do a BIOS update. The problem is that I cannot boot. Not into windows, nor to CDROM or anythingg else. It is not even letting me to enter the BIOS setup.

How could i flash 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 BIOS successfully and rebooting i got rid from the CPU message instead i got Image i removed all the USB devices , and the front USB wires and placed the mother board on a non metal surface but will have this USB message , any idea

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2  
Unleash the Core 2 Quad back into the motherboard, unleash the BIOS update, unleash the Core 2 Duo. – ta.speot.is May 31 '14 at 9:12
    
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 – Jonny Wright May 31 '14 at 9:50
    
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 – Alexander May 31 '14 at 13:18

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
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He already successfully updated, though. ;) – Daniel B Dec 10 '15 at 18:01
    
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). – Hennes Dec 10 '15 at 18:03

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