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#21
Then I got lucky when I bought my 2 TB NVMe. I had no idea about OpROM. Seems this may be a Samsung thing though.
I found this: [Guide] NVMe-boot for systems with legacy BIOS and UEFI board (DUET-REFIND) - NVMe Support for old Systems - Win-Raid Forum
And this: A BIOS to UEFI Transformation