How to downgrade BIOS in DOS. This method requires the Engineering Edition of AFUDOS. You can google 'Afudos Engineering' to find some. United States. Download all AMI BIOS Flasher utility (AFUDOS, AFUWIN, AFULNX, AFUEFI) versions from Wim's BIOS.
I’ve hopefully bought a new CPU to stick in the office server. All being well, it’ll be super quick and so on.
Looking at ASUS’s website, I made sure to choose a CPU the motherboard supports. I saw it required a BOS update, so fine… that shouldn’t be hard, right?
Think again.
- Downloaded BIOS file (possible from this link)
- Downloaded FreeDOS, burnt to CDR so I could boot into a DOS like environment.
- Copied BIOS file + AFUDOS update utility to USB stick.
- Rebooted, booted off CDR, chose to run LiveCD (No Drivers)
- Then tried to use AfuDos.
- Be good – take a backup first (afudos.exe /obiosbackup.rom
- Try and install a newer one (afudos.exe /iM3N78-~1.ROM) – fails with a message like “invalid bios id in rom”. Quite unhelpful.
- I tried various different .rom file names, but no combination of motherboard (M3N78) and bios version name seemed to work.
- Eventually, Googled a LOT more, and found that there is an ‘engineering’ version of the AfuDos tool, which allows you to force the update, and ignore any stupid check….
- For the sake of it, I tried to restore the backup I’d taken, using the original afudos.exe, but this didn’t work (WTF?)
- Downloaded ‘engineering’ afudos tool (try e.g. here)
- Ran with ‘afudos.exe /ibiosbackup.rom /n’ (the /n tells it to not do the stupid check) – worked… OK.
- Rebooted
- Entered back into DOS, and ran: ‘afudos.exe /iBiosIWantToUse.rom /n
- Crossed fingers, hoped I wasn’t going to brick the stupid motherboard…
- Success.
- Reboot. Carry on life.
The ‘onboard’ ez-flash utility ASUS provide seems totally useless.
![Afudos engineering edition Afudos engineering edition](http://picsworth.com/files/twi/imgs/softwares/speedzooka_speeds_pc_01.jpg)
Oh well, hopefully we’ll soon have 6 cores of goodness powering Jenkins.