@Balto - great you have it working now!

@wolfvn - sounds like you do not need BIOS mod for that BIOS, so if you applied NVME mod to it then that's probably the issue.
If you did not, then make sure BIOS is set to UEFI mode (or windows8-10 if you see OS Type setting), then follow all steps at #4 on page one in the "This is what you should do" section.
Make sure your windows install media is on a GPT initialized USB partition

If still no luck, boot back to your old windows with this drive installed, and see if you can see the drive in device manager or disk management. If not, then NVME adapter may be DOA, or you need to try another PCIE slot.

Thank you @Lost_N_BIOS. I have changed new NVME adapter and try another PCIE slot but can't see the drive in device manager or disk management.

Did you mod BIOS, or not? If you can't see it in device manager or disk management, as a secondary drive when you have booted to another installed windows, then drive may be faulty

I test the computer where I bought the adapter is working. Please help me to mod bios http://asrock.pc.cdn.bitgravity.com/BIOS...e4(3.50)ROM.zip. I have mod but may not be the right way. Thanks a lot

That's why I asked, this BIOS already NVME capable based on your previous comment/copy of the change log, so if you mod if then it may mess up the stock compatibility. So please reflash stock BIOS now and try again, meantime yes I will look at that BIOS
* Edit @wolfvn - Yes, this is the problem here! that BIOS is already NVME compatible, do not modify it. Reflash stock BIOS and try again. If you are installing windows 8-10, your USB must be initialized as GPT and then you make partition on it and put windows install media, then install to GPT or RAW disk

Reflash stock BIOS and try again. drive Ssd still not detected. Maybe my drive is not compatible with the mainboard? Thanks

@wolfvn - "Still not detected" what do you mean by that? Are you now in windows on another main drive, with this one connected as a secondary? If not, do that now, and see if you then can see the NVME drive in Disk management or not. If not, the drive itself may be DOA
There is no compatibility thing like you mention, especially when trying to use the drive as a spare secondary data drive, as mentioned in my test scenario above.
In that manner, you would always see it show up as a new drive in disk management. Unless your PCIE slot is disabled or damaged (test others), your adapter is faulty, or the drive is faulty.

I can't see the NVME drive in Disk management. Pcie i try with graphics card is working, nvme add+ adapter i try other computer is working. Thanks

Did you try all slots on that board? If yes, maybe you need mod BIOS, but before they add the NVME, older BIOS without stock NVME Support, then mod it
So you confirmed the NVME adapter and drive is working on another system? If yes, good, at least you know they both work.

@ Lost_N_BIOS This is bios not yet support NVMe http://asrock.pc.cdn.bitgravity.com/BIOS...e4(3.20)ROM.zip or http://asrock.pc.cdn.bitgravity.com/BIOS...e4(3.00)ROM.zip. Please help me to mod bios. Thanks a lot.

@wolfvn - Here is NVME Mod 3.20 BIOS, if that works, maybe I can make you latest BIOS with stock NVME support removed and add usual NVME Mod
Flash using Instant Flash, do not rename file - http://s000.tinyupload.com/index.php?fil...166242308626104

If this does not work, you have some issue with hardware somewhere, or possibly settings you are using etc.
Confirm not working by checking with drive as secondary/spare, booting to some other HDD/SDD as main drive, then test with NVME on all slots like that to see if you find in device manger or disk management.

@Fernando - have you seen this tested, and it worked (remove stock NVME Support (x3 files) and add mod NVME)?
Seems stock BIOS NVME newly added compatibility is not compatible, making old BIOS + NVME Mod as test now

I'm probably DAU, but I have no idea how to manipulate and flash BIOS (at least, I'm not shure about killing something)

The onboard SSD is too small and not safe anymore, so I should replace it by a better one, but there seems only NVME types availabe :-(
ASUS seems not very helpful

I would give a try to Samsung 970 Evo Plus 1TB or 970 pro 1TB.

BIOS URL is: https://www.asus.com/de/Laptops/ROG-G751JY/HelpDesk_BIOS/

Hardware is i7-4720HQ CPU with recent available BIOS V.213. Is there more info needed (CPU stepping/mainboard)?

Would you do me the favour and mod a convenient BIOS for me?

TW

@Fernando - @Torchwood - all BIOS in that that thread are user specific, anyone that wants mod BIOS must first unlock BIOS lock/ SMI Lock, then give me their dumped BIOS region by FPT, then reflash BIOS region I modify for them.
Torchwood, please make a post in that thread linked above, I will make you mod BIOS. See post #86 first, do that, then see post #83, do that, and then send me the created file. Be sure you do #86 first

If you do not want to go through all that, there is PLENTY of SSD out there, not sure what you mean by only NVME Left. I see lots of SSD, VERY VERY Cheap now.