@Fernando:
The same drivers that you had recommended. Under Point H-mod+signed. Downloaded the 64 bit version.
Link: Recommended AHCI/RAID and NVMe Drivers

Just that I 'deselected' show only compatible drivers(Screenshot2). Chose RD400 instead of XG4-DEV115.
OCZ SSD Utility does recognize the SSD with RD400 drivers as well as XG4 driver. (Screenshot5) This ones with RD400.
Gave me the highest rated speed. (Screenshot7)
Toshiba catalgoue PDF. THNSN5256GPUK. Page 11 in the PDF. Rated speeds are around 1500/760Mbps. I am INDEED getting those speeds with the said driver(RD400). So all in all, very happy.

Let me know if you need me to clarify anything else.

@Fernando
Apologies for any and all miscommunication. I must admit I am fairly new to this, "NVMe business". I just wanted to contribute back my findings. Might be useful to someone.

And regarding that 'adding the device IDs', I think it is something best left to you. That is beyond my understanding to be honest.

Cheers and let me know if you need anything else at all.

@Fernando
Thank you so much, your posts in here helps and the drivers you provided are working!

I have some major problem, maybe you will be able to help me resolve it:
In short: I am trying to upgrade my Lenovo Y700-15ISK with SSD: Toshiba THNSF5256GPUK 256 GB PCIe M.2,
But it's not working so good, when I am using the Drivers you provided, mainly the RD400, I was able to see my SSD as one SSD that is located on Disk 1 (without any thing on disk 0),
What driver should I use to maybe resolve it?

BTW here are some details:
Phatnom Disks

And also, another question, since I have 4 controllers for this disks, should I use the drive 4 times? or not?

*fixed the picture of the 3 options*
I am using windows 10, but I needed to format my system and start over, it just refused to boot or recover.
What I did was to get all my system stable and working (like it is now), windows updated and drivers updated, then I added the Unallocated SSD and boot from the other HDD,
Then i went to the Storage Controllers and updated them, I tried to update them from the 3 options available,
Only with one of this 3 I got the option to chose from a list similar or identical to this one,
Remember I have 1 SSD but it is shown as 4 so i have to update the driver 4 times.

At the first time I tried to update them all to the one that is starting with XG3, then nothing happen, i just had 4 SSD's and its not a good situation that 1 SSD is seen 4 times, then I again updated all the 4 controllers to the one named "RD400", and something worked!
I was able to see only 1 SSD and I have only 1 SSD and in DISKPART the SSD was listed as DISK 1 (this never happened before, the SSD was always DISK 4 or 3 in DISKPART, so then when I saw it changed, I tried to do a restart, but from this restart after i updated the 4 controllers to the RD400, the windows just wans't a working, and i had to remove the SSD and to format the other drive, since no CMOS clear or battery removal, or recovery would not work.

Now I want to try to insert the formatted SSD again, and I need any help I can get, since there is a chance that after I will update this Drivers, Windows will not work and ill have to format again. :(

The same SSD, Its a problematic SSD, mine is SED and the one in this post is the same one but non SED, I want to try and take the same Drivers that are the most stable for him and try to use them in my Laptop

Regarding to clean UEFI installation Directly to the SSD, I actually tried that 3 times, it failed after about 2-3 hours in all 3 times, this kind of Installation is taking 7 hours,
To do the same Installation on the WD HDD, will take less then 50 minutes.

This is why I only want to get to a situation that I can boot from the HDD when the SSD is only connected to the laptop.

The plan is to then copy the System from the HDD to the SSD.

I don't see any other option, unless you think there is a way to first install the drivers and then install the windows in some way :(

Sorry it's so complicated :(

P.S
What I am describing the copy of the system vs a clean installation are 2 options i did few times in the last week, I am now in day 10 of experimenting with it :(

The SSD is now again connected to the laptop, but when I try to use the mod version that should fit XG4, if fails:


What I am asking is if I should try to pick one of the others:


Since last time it didn't work and this is why I am here to ask before I do this mistake again...

Thanks you so much for this page

EDIT by Fernando: Inserted pictures resized and re-attached (to save space, they can be enlarged by clicking onto them)

I found it in your site, this is amazing site, I am reading it now, Thank you so much for this site!!!!
*Update*I am starting only now to Certificate, but the windows is crushed when I tried to install the driver :( ill update if ill find a way to install it, I hope i dont have to reinstall windows now again :(
All the info I can provide now is this:
Controlers HardwareIDs
Crystal Info
Disk Manag
Preformenc test
As you can see I was able to install windows on the SSD and also remove the Phantom disks with the Drivers you provided, without any drivers the system have many other problems,
I wonder if you have an idea how to solve this problem with the 1 Disk that need 4 controllers, I tested their IDs they are all the same.

Maybe the 4 disks are the SED, how can that SED be canceled or ignored or deal with?

The system seams to be stable, I mean boot time is close to 60 seconds now at start (its 20 seconds with the WD HDD, and Shut down takes 120 seconds to Shut down, with the WD HDD its less then 10 seconds), and to wake up from sleep is a 50/50 chance (it takes about 2 minutes to start sleep mode and about 4 minutes to wake up from it, so I will avoid it in any way), but other then crushing in sleep mode, it seams to not cruse in any other situation....

hi, Since i needed to install windows on the SSD and I did it 3 times and then the SSD wasnt working and every instillation is taking 7 hours, I needed to create a fastest way to reinstall windows 10,
This is why i created a 120 GB partition on the HDD, so I will be able to copy this Partition as it is to the SSD and then boot from the SSD that have windows 10 updated and all the drivers and thing I need, it did not work good with copy 1T drive into 256 GB SSD, so instead of fighting with it i am moving 120 GB into the unallocated 256 drive and this is what you see, its just to shorten the process.

I understand from you that the SED and the non SED will have the same drivers?