Just update of my issue with Toshiba THNSN5256GPU7: after several attempts to install Win 10, following the point 6 of the Guide on the first page, I did not succeed. The SSD still be not vissible durring Windows installation, even with manual Nvme driver installation from another USB drive.
Yesterday I receive another SSD Tohiba THNSN5256GPUK and both the Bios and Device manager, recognized it without any additional driver installations or BIOS settings, with the Windows native Nvme driver.
I do not know if the difference from the last symbol is decisive, but it is a fact that the new SSD is recognized and works without problems.
Because I can not test the THNSN5256GPU7 SSD of another system, I only have the chance of getting into a bad/faulty SSD drive.
So, Thanks again for your support!

Attached in the spoiler.

Good day! Please help me. I flashed the modified BIOS with the driver NvmExpressDxe_3.ffs, downloaded by reference in first page and using ASUS EZ Update utility. The firmware went ok, but my SSD Samsung 960 Pro, connected via the M.2-> PCI Express x16 adapter (video card slot), is not detected in the BIOS. But Windows 10 perfectly sees it and works with it. The last BIOS for my motherboard was downloaded from the site of the ASUS, I checked that it had drivers to support NvmExpress. For testing I tried on a clean firmware, the BIOS can not see the disk. What else can you try to do?
P.S. I noticed one feature in the firmware. If I write the clean bios, then when EZ Update offers to reboot, the computer after Windows 10 shutdown turns off for a couple of seconds, and turns itself on. But if the modified BIOS is flashed, this short-time turns off does not occur, the usual reboot is taking place. I had a suspicion, is the modified BIOS run in this case? Maybe, after the flashing, a check is performed before the reboot, and if the BIOS is somehow "wrong", then it is restored from a backup (the motherboard supports the DualBIOS technology), or is it booted from the backup?

My system:
MB: ASUS P8H61-M LE R2.0, Intel H61 chipset, B3 revision; CPU: Intel Core i5 3450; Disk Drives: 500 GB Seagate SATA HDD + 500 GB Samsung 960 PRO SSD; Graphics: Onboard, OS: Win10 Pro x64

Hello. I bought ADATA SX8000 NVMe SSD and so far I'm unable to boot it with my ASRock Z97 extreme 4 mobo. I tried standard and modified BIOS as stated on this page, with modified BIOS my drive is detected as PATA, with the standard it shows as ADATA but I'm unable to boot with "Reboot and select proper boot device or insert boot media in selected boot device" message on both. I tried turning off and on various bios settings and nothing, but one thing I noticed is that it says no matter what that M2 is not connected and with disabled CSM it does not even show PATA or ADATA device. On the drive, I have freshly installed W10 (I tried installing it on both modified and standard bios multiple times) that I installed via my USB drive. Any users with a related experience that could give me some kind of help how to be able to boot? Thanks for any reply.

Welcome to the Win-RAID Forum!

Thank you!

Please attach the BIOS, which had been modified by you, as *.ZIP or *.RAR archive. Then I will do a look into it and check, whether the NVMe module has been inserted the correct way.
Ok, tonight!

How did you recognize it? Have you seen any Disk Drive named "PATA_SS:" within the BIOS?
Unfortunally no, always only HDDs and DVDROM

Provided, that you have correctly inserted the NVMe module into the BIOS, you should be able to get Win10 installed onto your NVMe SSD, if you follow my advices layed down within the start post.
Well, now for me the main thing is that the SSD can be seen in the BIOS. After that I want to transfer Windows from HDD to it

Zitat von Fernando im Beitrag #2884

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@-=N&N=-:
Please attach the BIOS, which had been modified by you, as *.ZIP or *.RAR archive. Then I will do a look into it and check, whether the NVMe module has been inserted the correct way.

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Hello. I recently purchased ADATA XPG SX8000 NVMe drive and I have been trying to boot it up for 3 days now. My motherboard is ASRock Z97 Extreme 4, which officially does not support Gen3 x4, however, I'm able to see the drive and I successfully installed the W10 OS multiple times already. However, the problem is that I'm unable to boot it up. I tried turning off and on various settings in BIOS including CSM (on disabled I cannot see the drive at all). The only successful partial success is with CSM Enabled, I'm able to set it up as priority booting device in the BIOS, however, I will get a "Reboot and select proper boot device or insert boot media in selected boot device" error. I'm desperate, I tried everything by now, and if I will not be able to get it working I will probably return it. Did anyone had a similar problem with following driver or motherboard? Do I need something specific? I will be glad for any help.

PC configuration: ASRock Z97 Extreme 4, ADATA XPG SX8000 512 GB, i7 4790k, 2 WD Blue 1TB drives.

Yes, it looks like I'm confused, the wrong driver was introduced. I downloaded it again and created a new BIOS. And even with the firmware did as recommended for motherboards asus: before flash the firmware changed the file name to a modified one. And this time the bios was flash correctly, with the power turned off. And in it appeared SSD! Further under the instruction put Windows 10, all perfectly has passed, the system flies! Very thanks!!!