Hi Haydar,
The BCD is inaccessible. Unless the EFI partition is fixed, the updates or in-place upgrades will not work. We can try to create a new EFI partition and install the updates before rebooting Windows, but it's too much work since 40 systems are affected by the same issue. I think it's tough to narrow down the issue. It must be a low-level driver.
If possible, share the following logs from two affected systems:
- msinfo32 NFO log
- The System event logs (.evtx)
- Farbar scanner logs.
Download Farbar Recovery Scan Tool 64-bit (FRST64.exe)
https://www.bleepingcomputer.com/download/farbar-recovery-scan-tool/
(or) https://downloads.malwarebytes.com/file/mbst-frst64
Note: If Microsoft Edge or Chrome mislabels the Farbar Scanner executable as PUA/malware, choose to keep it by tapping … in the bottom bar, choosing Keep, and then choosing Keep anyway in the dialog that appears.
See this screenshot: https://learn.microsoft.com/en-us/deployedge/media/microsoft-edge-security-download-interruptions/dowload-was-blocked.png. It's a safe tool used in most antimalware forums.
If the OS language is non-English, rename FRST64.exe to FRST64English.exe.
Run the program. Don't check or uncheck any options. Click "Scan".
Add the two logs, FRST.txt and Addition.txt, to a Zip archive, upload them to your OneDrive and share the link here.