Since the ISO containing the entire release image is HUGE, many users will likely want to copy it to a USB drive rather than mounting it as virtualmedia through the BMC.

USB mass storage devices require a master boot record to be bootable, unlike optical drives which use the El Torito ISO9660 extension to make them bootable.

To turn add an MBR to an El Torito ISO to make it bootable in either mode, we can do:

isohybrid --uefi agent.x86_64.iso

Based on how CoreOS does this when building the RHCOS live ISO, it's possible that this is only available on x86-64: https://github.com/coreos/coreos-assembler/blob/d962de68b75f493b6435b6aa12f692fe67c1af15/src/cmd-buildextend-live#L734-L737