Windows 2012 R2 Server was unbootable after applying October 2021 Windows Updates.
- Go into Edit Settings on VM and switch the Windows boot disk to SCSI Controller 0 (it was on 1 which was the paravirtual.)
- Force VM to boot into EFI Boot – verify it sees the disk now
- Try to reboot normally – no go same error
- Boot to CD ROM ISO for Win2012 R2
- Go to Repair System, Troubleshooting, Command prompt
- Run Diskpart
- List vol
- Select the FAT32 UEFI Hidden Volume – volume 2 in this case
- In diskpart assign a drive letter to the UEFI hidden partition “assign letter k:”
- Exit diskpart
- cd /d K:\efi\microsoft\boot\
- bootrec /FixBoot
- ren BCD BCD.old
- bcdboot c:\Windows /l en-us /s K: /f All
- Reboot
- New boot error
I tried booting into Advanced options and disabling driver signature verification but the server still wouldn’t boot. Searched on this new symptom and finally found a thread that lead to the fix. It turned out to be an unsigned SCSI Paravirtual driver pushed by Windows Update. Kudos to u/oddie121!
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