I had my system working fine for 2 days with NUC5i5RYH and Samsung SM951 AHCI M.2 PCIe 128GB. Windows 7 64bit Service Pack 1.
Then I decided to upgrade the BIOS to ver. 350 because I hoped it would deal with the poorly working WiFi. Now it won't boot! It tells me to reboot and select proper boot device.
In the BIOS the SSD is recognized under Legacy. Not under AHCI.
Tried to re-install Windows. The SSD is recognized but I get the message that Windows cannot be installed on the disk and that I should check in BIOS that the disk's controller it is enabled.
Tried to change a few settings back and forth in BIOS but nothing helped.
Then I flashed the BIOS back to ver. 348 (no idea to be honest what it was shipped with). Nothing changed. All the same as with ver 350.
Any idea what I could do to get things working again? I'd appreciate a lot if anyone could help me.