In place windows 11 upgrade results in a BSOD after the first restart.

[Windows Server]

I've been trying to do an in place upgrade of my Windows 11 system to see if it will fix some issues I am having. I have tried the 'old' in place upgrade using a 24H2 ISO and also tried the newer Settings/System/Recovery Fix problems using Windows Update /Reinstall feature.

The upgrade goes fine in both cases but when the system reboots to Windows it gets a BSOD INACCESSIBLE_BOOT_DEVICE. It appears the upgrade has mucked around with my boot device so that it can't be found. My boot device is setup properly in my BIOS and I've had no problems of this sort other than doing this repair install. When I reboot again things go into revert back to previous version mode to what I had before. So this isn't your run of the mill boot device problem. As I said the install must have made my boot drive inaccessible in some way. After I'm back to my previous version it boots just fine. Also restoring a disk image I took prior to the repair install boots fine. So it must be the install playing games on me. Maybe it's downloading some incorrect disk controller drivers. I boot from a NVMe M.2 PCIe Gen4 SSD.

Any thoughts on this?

BTW... I did a clean install with no problems. I didn't stay with this as I have way to many things to reinstall and don't have the time or where with all to do it.

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