Bootable DOS image BIOS upgrade

I was struggling with BIOS upgrades for our new Dell servers, as there were no bootable ISO for BIOS upgrades.
After searching for DOS bootable ISO media I have found FreeDOS project. Unfortunately FreeDOS 1.1 LiveCD image is not available on

After modifying standard fd11src.iso image I finally achieved what I needed.

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.


Generate lines in vi editor

When you need to add multiple similar records to a configuration file (IP addresses for example), you may use vi editor to do it directly:

 :r! for i in $(seq 1 5); do echo "This is line \#${i}"; done

This command wil generate 5 lines:

This is line #1
This is line #2
This is line #3
This is line #4
This is line #5

Similar command used to generate Reverse DNS entries in BIND:

 :r! for i in $(seq 1 5); do echo "$i PTR host${i}"; done

Line numbers can be changed, modifyng the $(seq 1 5); part.