WD Black SN850X REFUSING to show as a win10 boot drive

WD Internal SSD WD_BLACK | Blue | Red | Green | Gold SSD
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Edit: Resolved. The PC technician in my area made a few calls after I explained that I have tried every compatibility/software/bios trick in the book, and he found that it had a faulty OS Boot Drive Controller. I decided to keep my drive and use it as secondary data drive. He gave me a WD Blue and my system is now faster & more stable than ever. Still a huge upgrade from Samsung 850 Evo. SanDisk support reached out and offered help for the RMA process but I’ve decided to keep it as is and suffer any potential issues later.

WD Black SN850x.

Motherboard : Gigabyte b550 gaming X v2.

CPU: r7 5700x.

I wanted to change my boot drive from an old EVO ssd to this shiny new NVME. Only to find out, after 3 hours of troubleshooting, frustratingly wiping all my drives, frustratingly disassembling the computer, taking everything out, resetting CMOS, updating BIOS to latest version, STILL not working. Spending another 12 hours chasing ghosts trying to get useless AI to help me. It refuses to show up as a bootable drive after installing the win10 image onto it. It shows up before - not after. What a piece of garbage company that instead of a drop of transparency or recognization of the issue, inadvertantly causes disasters like this to happen. My system was working great. I had some stuttering issues so I wiped the drive clean that held all my games and large files. Only to find out later that this previously functioning drive does not in fact function. FML!

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@ReeeeJones
Have you checked our knowledge base articles?
( Get Support for Your SSDs and Flash Products | Sandisk )

Try this one.

Have you opened a Support Case?
If not, contact SanDisk Technical Support for assistance.
(Contact Support | Sandisk)

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In the BIOS, manually set the link speed for the M.2 slot from Auto or Gen4 to Gen3, and make sure to install Windows in UEFI mode.

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Hello Bonirl, yeah I did try that. It turns out the problem was that there is a faulty OS Boot Drive Controller within my WD Black, preventing me from booting an OS onto it, but still remaining functional in every other way. The PC Repairman in my area provided me with a WD Blue. He was a bit puzzled and had to call a friend to figure out why - as I have tried every trick in the book in terms of compatibility and anything I can do on the software side. I am using it as a secondary data drive now. Unfortunate, however he waived the diagnostic and labor fees and just sold me a new drive. My computer is now more stable and fast than ever with zero issues.