The Serpent Rider wrote on 2022-01-19, 19:19:
There's a misunderstanding. The only Samsung NVME SSD which has legacy bootrom is Samsung 950 Pro, which is quite old already. Another NMVE SSD with such support is Plextor M8Pe, equally outdated, and that's it.
I will test this claim (perhaps, without a promise of commitment) in the following manner:
I have two systems, one uses an ASRock B250M Pro4 motherboard, and the other uses an MSI 970A-G46 motherboard.
The ASRock board is my current system, and houses a 970Pro drive, and boots to Windows XP, without a boot intercessor.
The MSI board had a UEFI module injected by a third-party modder, and will not boot a 2018-circa Lite-ON NVMe drive.
If the MSI board boots the Samsung drive, then it lends credence to my suggestion. If not, then there's something wrong with the MSI BIOS implementation (it does in fact also refuse to boot from certain brands of USB sticks).