[gentoo-user] Update BIOS with 4MB .exe

[Grant]

I'm amazed this is so difficult but I've just spent 3 hours trying to
update the BIOS on my Dell XPS 13 and hit nothing but dead ends.  The
root of the problem seems to be that the 4MB BIOS update file is too
large for the available 1.44MB DOS boot disks.  Apparently FreeDOS had
a LiveCD available at some point but it has reportedly been
unavailable for quite some time.

The following method looks promising but it also doesn't work.  DOS
can't seem to execute the .exe file which sits outside of the boot
image:

http://en.gentoo-wiki.com/wiki/FreeDOS_Flash_Drive

Does anyone know how to do this?

- Grant