I've been trying, unsuccessfully, to update BIOS so that I can upgrade my processor from a 1.5 MHz to a 2.4 MHz pentium 4 (currently I have a Pentium 4, 1.5 MHZ, 400 MHz bus, 512 MB ram, windows XP home). To update BIOS (the Motherboard is an Intel D845HV with 845 chipset), I downloaded Intel's flash memory update utility, created an upgrade boot disk, and rebooted the computer. But I get the following error messages: H48: update BIOS does not match currently installed BIOS type H01: The flash dataimage read from disk was found to be not valid S20: BIOS ID validation failure - flash update was unsuccessful However, I'm positive I have the correct upgrade - the motherboard is D845HV as identified by a software ID program, and I saw the label on the motherboard. I've checked and rechecked the intel website to make sure that I downloaded the correct upgrade. I've tried the following things in addition: I removed the CMOS battery for 20 min, reinserted it, and then tried to reboot with the upgrade disk. I also changed the jumper setting for BIOS repair - but when I did that, the floppy didn't work, so I guess the upgrade disk is not the same as a recovery disk? I have also tried the express BIOS upgrade program and that doesn't work either. Anyway, nothing I've tried has worked. I posted about this awhile ago and someone suggested that I 'force' the upgrade - does anyone know how to do that? If you do, please give reasonably detailed instructions - I've never done this kind of thing before! Thanks!