[Guide] NVMe-boot for systems with legacy BIOS and UEFI board (DUET-REFIND)

Hi and welcome!

Please provide some additional details.
What is the exact model of the SSD?
What BIOS version do you use?
What other devices are enabled in BIOS (like additional SATA controllers)?
What are your boot options in BIOS?

Best regards,
Mr nUUb