T7820 windows 11: ssd in flexbay windows does not boot after driver update

@RABAsirap , what is the status of your machine?  If it still have BSOD due to incorrect driver, you may try to boot into safe mode with networking so it can install a proper driver itself as Windows has the ability to repair.  Follow this process to enter safe mode https://www.dell.com/support/kbdoc/en-us/000124344/how-to-boot-to-safe-mode-in-windows-10

Mazzinia in an above post pointed to a similar issue: https://techcommunity.microsoft.com/t5/windows-11/windows-11-doesn-t-recognize-an-m-2-nvme-in-a-pcie-slot-after/m-p/3062052

Thank you. Actually I had a real hw problem which I solved in the meantime. 

So by now the problem is reduced to unavailable (working)  Raid driver for Windows 11. 

 The first driver in the above list, which Dell recommends works during the session it was installed. On exit and boot windows shows a blue screen and during save-boot and recovery I have to fall back to the last restauration point.

Under windows 10 this was no issue and I could access the ssd in the flex bay.

So the challenge is to either find a driver which is working with windows 7 or wait until one is available, to forget about using the flexbay ssd or to go back to Windows 10 (which can only be temporary until it is not anymore supported by Microsoft)).

Replace windows 7 by windows 11. This is a typo.

No Raid Volume set-up. 

1 LFF SDD DRIVE, 1 SATA DRIVE and 1 NVME DRIVE

This is what I know about my HW configuration:

If you don't mind, can you tell me about your current settings.  How many drives (and type of drive) are connecting to your system and which connection do you use?  Do you have any RAID volume setup?  Any RAID controller, LSI, VROC upgrade key?

If nothing add-on beside Dell factory installed devices, I suspect that you will only need a correct Intel VMD controller RAID driver. 

Edit:  which drive do you have Windows installed on?  Do you use a new drive for all of this testing?  If you didn't, clone your drive while working with the repair/testing so you have a backup to go back to.

If I remember correctly, Flavius issue was SATA RAID driver.  The NVMe drive appeared to be installed with Intel VMD RAID controller driver correctly.  If this is the same issue with OP, the simple solution is setting SATA mode to AHCI.

Thank you for the info.  I assume the LFF SSD and the SATA drive is installed in lower flexbay 1 and the NVMe SSD is installed in top (right) flexbay 0, and Windows is installed on NVMe drive? 

While waiting for the picture to display properly (not visible to me yet, just a triangle on my screen), can you check under device manager => storage controller to see which driver you have.  Also, check in BIOS settings for SATA operation mode, is it RAID or AHCI, and the Intel VMD, do you have both PCIe0 and PCIe1 checked, and set to AUTO.

Why don't we try the method that Flavius Aetius used for his case ? Maybe he's in the same situation.

In Windows 11, don't install the dell driver package, but download it.
Then using 7zip , open and extract the content, and install the driver located under IntelVROC_f6_iaVROC_win8_64 

In Flavius Aetius case, the bsods were caused by installing the IntelVROC_f6_iaStorE_win8_64 alongside the other, and he solved it for his setup by installing only IntelVROC_f6_iaVROC_win8_64 , that's the one needed for the NVMe

When coming back to what we said yesterday.

This driver works during the session it was installed and shuts the system down on reboot:

 The Dell diagnostics tool tells me, that there is no driver installed.

In order to make the driver work, would it be necessary to configure/install something else ?

Or do we need to find another version of the driver ?

I confirm : locations of the drives as you say.

However Windows is on the LFF ssd. And the SATA- drive in the lower left location works as well. 

My bios settings seem correct as well.

Here come the screenshots: