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for running firmware updates for some (older) devices

Or those who run non-vendor-supported OS on their computer, FreeDOS is often their only way to upgrade BIOS/UEFI.

FreeDOS doesn't work on computers with UEFI

FreeDOS doesn't work on computers without a PC BIOS; there's a difference. Look up 'Compatibility Support Module'.

Or not so old devices...

Yes I use FreeDOS on a USB flash drive to run BIOS updates on current hardware.