Cannot restore BIOS on ASUS mobo

Acer / N/A
June 26, 2009 at 14:02:28
Specs: Windows Vista, X26000/ 4GBDDR800
Okay, so I flashed the BIOS on a brand new (but has been in box for a year or so) Asus M2N-MX and now it wont get past POST giving me the CMOS Checksum Bad and CPU NOT SUPPORT! errors.

So I put the backup CD and press ALT+F2 and get to restore but it says that the M2N-MX.ROM file is too old.
So I download previous (to the dodgy one) rom file and rename it as above but then the restore program finds it then says cannot find ROM file.
I tried with CD-R, CD-RW but no luck.
Is there something I am missing here in renaming the file/burning it, or am I just stuffed?

Cheers in advance. Oh, and if you get a sense of Deja-Vu...same thing happened with same mobo last year (this is the replacement). That one was dead and had to be replaced.

I am off for a new one tomorrow if this takes any more time to fix. Grrrrr.
And I know, I never learn...never flash unless necessary-it just wasn't recognising my RAM and a few other oddities so I thought I would try it.

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June 26, 2009 at 14:23:39
You should be flashing from DOS by using your floppy drive. Don't have a floppy drive? Get one!

Use this 2 floppy approach:

floppy 1 = WinME boot floppy
floppy 2 = BIOS ROM file & flash utility (M2NX1004.ROM & AFU236U.exe)

1. boot off the WinME boot floppy, select option 4 (minimal boot) & wait for the A:\> prompt

2. remove floppy 1 & insert floppy 2

3. type AFU236U then press ENTER

4. follow the instructions

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June 26, 2009 at 14:27:52
Once the flash is done you should enter the BIOS to reset values as required.

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June 26, 2009 at 14:35:39
You guys are gonna kick me but I have no floppy drive and cannot get into BIOS by pressing DEL.
I am now getting the message Checksum Data Wrong (as opposed to BAD!). Why will it read the backup .ROM file but then tell me it is too old and then not read the updated BIOS files that I renamed?

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Related Solutions

June 26, 2009 at 14:45:40
Also interesting to note that the BIOS I used has the following feature:

Add protection from downgrading BIOS version

I am thinking this will stop me from putting in an earlier (and more stable) BIOS in??

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June 26, 2009 at 15:09:00

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June 26, 2009 at 15:15:03
I knew that was coming.......

Actually I could rob one from my daughters desktop...but I don't have any floppy disks. God, this just gets better.

I have burnt about 5 CD's now with different Bios Roms...any idea why it finds the M2N-MX .ROM file but then says 'cannot find M2N-MX.ROM file' ? Why does it always find the original one (some sort of secret setting?) and can I override its insistence that it is too old?

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June 26, 2009 at 15:17:07
You also need a PS/2 keyboard so you can access the BIOS.

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June 26, 2009 at 15:22:03
My wireless Microsoft keybd and mouse are working fine, as in they allow me to press ALT+F2 to get into the restore program. Just can't get it to read those BIOS ROM's...

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June 26, 2009 at 15:28:07
Dude, quit bashing your head against the wall...get a floppy drive, 2 floppies discs, then perform the flash from DOS.

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June 26, 2009 at 16:05:39
When you do as jam has strongly suggested, your wireless keyboard isn't going to work in the pre-Windows environment.

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June 26, 2009 at 16:17:09
I guess I'm way too "old school". Floppy drives, DOS, PS/2 keyboard, wired mouse, etc. Then again, I never have problems accessing the BIOS or flashing the BIOS, & never have to worry about batteries.

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June 26, 2009 at 16:28:11
I'm right there with you jam.
The cost of the floppy drive is the only reason OEMs don't install them. Has nothing to do with usefulness.

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June 26, 2009 at 16:39:02
I agree guys but I think on this one I am gonna replace the mobo. I can get a better specced AM2+ mobo which would allow me some upgrade potential should I want it for around £40 from my local PC shop. I can be up and running in an hour or so....this 'bust' mobo has taken the last 5 hours of my life and it still is not fixed.
Guess I was just hoping for a way to fix it with what I have.

Many, many thanks guys. You really are a great help but I am cutting my losses here.

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June 26, 2009 at 16:39:51
One final question as you are well up on this stuff...Gigabyte or Asus mobo?

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June 26, 2009 at 17:17:56
"Gigabyte or Asus mobo?"

Either is a good choice but you always have to look at the specs...northbridge, southbridge, audio chip, network chip, number of RAM slots, etc. It's always a good idea to google up some reviews & download the manual in advance too.

The board you have is based on an outdated GF6100/nF430 combo, I don't know why it was even used on an AM2 board (other than profit, of course). Even so, I think you're giving up way too easily. Floppy drives are cheap...IMO, there's no reason NOT to have one. Make sure to install one in your next build. If you had one today, you would have saved yourself about 4 hrs, 55

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June 26, 2009 at 23:19:57
Cheers Jam. As always, you're a star. I think I will go with the Asus. And no more BIOS updates!!

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June 27, 2009 at 05:25:31
The shop had a nice Asus M3N78-VM for £50 which has a nice array of audio sockets (so I can do a spot of basic recording and set up the surround system I had). It also supports Hybrid Sli technology which I think my card has; XfX 9800GT XXX edition. Either way, looks a nice board and will fit nicely into the existing unit.
As I am replacing an Asus AM2 board, would I need to reinstall Vista (again)?

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July 16, 2009 at 02:09:13
Copied from this page.

-- Updating BIOS with USB thumbdrive --

1) Download the HP USB Disk Storage Format Tool -

2) Then download the -

3) Extract the anywhere on your system (but remember where :) )

4) Install the HP USB Disk Storage Format Tool.

5) Run the HP USB Disk Storage Format Tool. Then instead of searching for floppy drive, browse to the folder where you extracted the content of to. Find the "copytoUSBkey" folder, then click OK.

6) Now run the tool to format your USB key.

This has been proven to work after various other solutions have failed on me.

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