The obvious problem with this is obtaining DOS bootable media for the system, especially since floppy drives are thankfully a thing of the past.
Dell used to support this method with the biosdisk project, and here is a more generic solution for creating DOS boot media.
Dell XPS 13 9343 (2015) receive them frequently with an always interesting change-log.
However Dell BIOS update file is shipped as an exe file. But in fact it is fairly simple to install BIOS update under Linux on the Dell XPS 13 9343 without have to boot Windows.
One of the items I've been voicing has been regarding better supporting Linux users with regard to a smoother BIOS/UEFI update process.
) and doesn't work for all systems, but this was something else.
Update: Comments suggest that gigabyte are now using 7zip, not rar as their archive format.
Well, there is a utility they support for updating your MSI motherboard BIOS from the Linux desktop!
Back in August I wrote about the pain for Linux users in updating the BIOS of some MSI motherboards as they packaged the BIOS ROM file within an EXE file, which places the burden on having a Windows installation but then this utility wouldn't work if the file wasn't placed on a USB flash drive and also if the Windows executable didn't detect the file was being extracted on a motherboard that matched the intended BIOS.