Thank you for contacting the Intel Communities.
I was able to find a video with some recommendations while installing Windows in a m.2 SM951
-Install the m.2 SSD and unplug all other SATA cables or drives that may be in your system.
-Set "Launch CSM" to disable status
-Secure Boot>Key management> Select Clear Secure Boot Keys
These options are for a different Motherboard, they may not be available in your BIOS.