FreeDOS .img was burned to a USB drive via balena etcher.
A UEFI only desktop does not recognize the FreeDOS USB stick for boot. USB bootup tests, on a BIOS laptop, indicates a successful legacy boot.
QUESTIONS
- What is required to be UEFI bootable?
- Is it possible to change the Partition table from MSDOS to GPT?
UPDATE
The Dell 7010 desktop firmware is old and for some reason: only UEFI boot. The Legacy boot option is greyed-out. Booting from the DVD/CD is not possible
The goal is to update the firmware with a DOS executable provided at this link:
https://www.dell.com/support/home/en-us/drivers/DriversDetails?driverId=5M70H
Best Answer
The FreeDOS wiki page wiki.freedos.org/wiki/index.php/UEFI tells us that it does not work:
A workaround would be to install FreeDOS in a virtual machine and set this virtual machine to boot in BIOS mode alias CSM alias legacy mode. You can use VirtualBox for that purpose.
Edit:
I found this link, that might be helpful:
wiki.archlinux.org/index.php/Flashing_BIOS_from_Linux