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#1
Changing from AHCI to RAID causes boot loop
I have a MySN XMG U716 (Clevo P775DM1) that I got with two 256Gb Samung 951 NVMe PCIe SSD's, initially in RAID 1. I later decided to break this RAID array because I wanted the extra 256Gb for games etc, and I broke the array by setting them to Non-Raid but leaving RAID mode enabled.
Somehow the BIOS has been set back to AHCI (possibly by the BIOS and KBC/EC Firmware Updates I've done, although I'm not fully convinced that it wasn't something else), but Windows boots just fine in AHCI mode, but I cannot see the NVMe Drives in Intel Rapid Storage Technology when they are in AHCI mode (because they're NVME PCIe drives that are designed to be used in RAID mode, not AHCI). So if I wanted to set up the SSD's in RAID 1 again I can't do it and keep my data by using the Intel RST.
If I switch Windows to Safe Boot from MSCONFIG and restart and change the Controller Mode to RAID I get the XMG Logo with the spinning circle for longer than it normally takes to boot, and then it pauses for a few seconds before going back to the beginning of the boot sequence as through you hit the restart button.
I had an issue with the Intel Extreme Tunrup Utility last year and Windows wouldn't boot afterwards, I couldn't figure out how to access the BIOS so I ended up pulling the CMOS Battery which reset to AHCI from RAID but back then I got INACCESSIBLE_BOOT_DEVICE" now I don't even get that, just an attempt to boot then restart.
I tried using a bootable USB stick created with the Media Creation Tool but it cannot see the NVMe Drives when set to RAID, only the two SATA HDDs that I also have. I believe it is also nigh on impossible to get the Recovery Environment to load RAID drivers as well as or instead of AHCI.
I'm at a loss as to what I can actually do to get these drives back in RAID mode so everything is as it should be, as the old registry tweaks (such as HKLM\SYSTEM\CurrentControlSet\Services\msahci) are no longer present in Windows 10 and the ones suggested for Windows 8 such as StartOverride for "iaStorAV" don't seem to be working either.