Bootable FreeDOS Live image for BIOS upgrade

Download Link:

I was struggling with BIOS upgrades for our new Dell servers, as Dell didn’t provide bootable ISO image for BIOS upgrades.
After searching for DOS bootable images I have found FreeDOS project.

Unfortunately FreeDOS 1.1 LiveCD mode is not supported out of the box.

Using modified iso image from this page you can boot directly to DOS without need to install anything:

To add your own files to the iso, just use trial version of Magic ISO Maker (300MB maximum), or some similar program.
Just put your custom files in FREEDOS folder and after booting you will be able to run them in DOS environment.

After boot process is complete run dir command to see what files are in current directory.


On the following picture you can see that Dell BIOS update utility – M620-0~0.EXE is present in the directory.

The only thing left is to execute it:

E:\FREEDOS> M620-0~0.EXE

This Bootable DOS ISO was tested on HP, DELL, Supermicro iKVMs and on VmWare.

Download Link:

31 thoughts on “Bootable FreeDOS Live image for BIOS upgrade

  1. Thanks for providing this download, it REALLY saved my bacon. For some reason the latest freedoms only allows an install from disk option. I used this to update a RAID controller firmware and it worked great. Thanks again!

  2. большинство утилит идут на английском если в школе не заставили учить щяс бы смотрел на английский как баран на новые ворота 🙂

  3. BIOS upgrade tool of SumerMicro (afudosu) can not be execute because too few free memory is available. 320K from 611K. Problem memory allocation.

    • Спасибо, но по моему гораздо проще добавить необходимый ехе-шкник в готовый iso 🙂

  4. Hello can i edit this bootable iso so i can add bios update files,but without corrupting iso itself.Sorry if my english is bad i hope you understood me.

  5. Is there a way to point to a batch file instead of going to e:\Freedos? I want it to go to the dos environment and then run a bios update script automatically.

  6. I was having difficulty locating a bootable DOS ISO in order to flash the latest BIOS version onto my motherboard. This helped. Thanks for sharing this!

  7. Thank you for the guidance – successfully updated the BIOS on MSI – 7376 Platinum motherboard, running Linux Operating Systems. Most grateful!

    • I did nothing to be honest – Live option was just commented out in the original FreeDos image, I just found the correct line to uncomment 🙂

  8. my dell won’t post. it goes to the dell splash screen and then goes to a black screen. It’s like it has no bios at all. The color of the light is complete orange which doesn’t blink at all. If I push the buttons for diagnostics it says “diagnostics starting” but then goes no further, just black screen.

    Is this dell beyond repair and could it even boot this iso given that it doesn’t seem to have a bios to begin with?


  9. Worked like a charm. Saved me a LOT of trouble getting my ASUS BIOS back in working order after some sudden mysterious boot problems.

  10. Hi,

    I am using Supermicr server and i am trying to upgrade BIOS .
    but when i execute command AMI.BAT i am getting following error

    rename:unkown error
    Bad command or filename – “AFUDOS.EXE”.
    File not found. – AFUDOS.EXE

    we have AFUDOS file in directory but it is in smc format

    Please Help me

    • @echo off


      AFUDOS.EXE %1 /P /B /N /K /R /C /L2


      BIOS updater script AMI.BAT wants to be smart, and it renames AFUDOS.SMC to AFUDOS.EXE, runs it, then renames it back. Which means that it’s not usable from read-only media.

  11. Still useful in the future world of 2019. Used to update BIOS on Supermicro X11SSM-F.

    A tip to any other future users: This ISO boots into E: drive which is not writable. Change to C: drive and then run FLASH.BAT.

    Another tip: I used isomaster on a Ubuntu system to open and add the BIOS files.

  12. Hi There, thanks for this great boot iso, please can you help?

    I need to run a command at boot , what the best way to do this? do I add it to SETUP.BAT or add an additional AUTOEXEC.BAT.

    Any help is much appeciated

  13. Tried it out on a Dell Inspiron Mini 1010, and after a bit effort, the laptop was bricked. I don’t know for sure it was due to this software in particular…I got the bios update from Dell, and used PHLASH16 to do the write. Partway through the flash, the screen went black, and the both power LEDs lit solid. It also started making a constant, loud buzzing.

    I don’t know if this was a failure of this platform (it might have crashed) or a failure of Phlash.

    Anyone want a cheap paperweight?

  14. I was also flabbergasted to learn I couldn’t create a normal functioning USB stick nor CDRom to be able to update the BIOS firmware. This ISO did the trick, so many thanks for sharing and caring!

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