Odyssey legacy BIOS boot support for 64GB EMMC device

I cant set the boot list to point to the EMMC device, like if i install a NVME card.
That card i can set in the boot list, so it can BIOS/legacy boot on that device.
It seems like you only can boot from the EMMC device, if the system you are installing uses efi boot.
It’s not that i cant install the OS on the EMMC device, but after wards it cant boot from it, because no where in the BIOS i can set the EMMC device as bootable (in legacy BIOS mode).

Any suggestions?