Windows 10: Cannot update computers from Windows 10 Pro 20H2 to 21H2

I have 25 computers to update. I've successfully done about half. Now I have 2 in a row that will not update from 20H2 to 21H2. Like many posts I've come across nothing has helped.What happens: I get through the process and get to 48% at the Windows is updating your computer screen at the end and I get a blue screen with "Driver_pnp_watchdog". Windows proceeds to roll back to the previous version successfully. When I log in I get the message "The installation failed in the FIRST_BOOT phase with the error during the SYSPREP operation. 0xC1900101 – 0x30018"What I've tried to fix: I've

:)

 

20H2 to 21H2

Yes. Windows 10 21H2 does not care whether you have a Legacy or UEFI bios. That's only a requirement if you wanted to try upgrading to Windows 11.

 

Updated from 20H2 to 21H2, no way to go back?

When your PC upgraded to 20H2 it must have been from version 1909 or earlier. That would require a full replacement of your system files and would have created a Windows.old to hold your old system.

Stating with version 2004 all subsequent versions up to the current 21H2 share a common set of system files so a full reinstall is no longer required. After the latest cumulative updates the 21H2 features were already in your system files, but were dormant. They are turned on by a small Enablement Package that installs like a cumulative update.

What is new for IT pros in Windows 10 version 21H2

If you really wanted to go back you can uninstall it like any other Windows update, not that I can think of any reason you might want to. 21H2 seems to have no new known issues, only the same ones as 2004/20H2/21H1.





Uninstall Windows Update in Windows 10

 

20H2 to 21H2

Great! One of my computers that I am updating from 20H2 to 21H2 has legacy bios. Will the enablement package work for that as well?