@Lucanorillo
The only Samsung NVMe SSD, which has an NVMe Option ROM in-the-box and is able to boot in LEGACY mode, is the 950 Pro.
Nevertheless you may be able to boot off another Samsung NVMe model in LEGACY mode, but in this case you have to insert a matching modded NVMe Option ROM into the mainboard BIOS. For details please look into >this< thread.
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