Hi,

> I am new to FreeDOS and would like to ask for any helpful hint how
> to create an modified ISO image from the actual FreeDOS version 1.2.

> My "aim" is simple - based on the FD12LGCY.iso image to create a
> bootable DOS ISO image with BIOS firmware upgrade software (DOS based).

creating a bootable ISO is difficult.

booting from USB should be much easier:

download RUFUS portable from rufus.ie

run it.

select 'freedos'  as start option.

this should create a bootable USB stick.   with a minimal install of
freedos.

place your firmware stuff on the stick, and you are ready to go.

Tom



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