Update to Windows 2004/20H2/21H1+

***Article Formally Titled: AVD Windows 10 Ent Update to 2004 - ***Alert***

We have found in several tests that the following process performed on your AVD Pool template and/or Golden Image (AVDSH00/WS00) has allowed successful deployments of hosts and dedicated AVD instances to Windows 2004/20H2 in Nerdio for Azure Environments.   

Here are those steps:

1.  Ensure a backup of the AVD Pool template or Golden Image (AVDSH00/WS00) has been taken
2.  Run all updates on the template/Golden Image including the Win10 2004/20H2 update and verify there are no pending updates completing by restarting the VM. 
3.  From an elevated command prompt run "winrm quickconfig".  Here's that output:
​​
4.  Run the following command in PowerShell. If any results are returned, see the steps below for removing Microsoft app packages before proceeding:

Get-AppxPackage -AllUsers | where-object {$_.Name -like "*cortana*" -or $_.Name -like "*ppip*" -or $_.Name -like "*input*"} | Select name | sort name

5. Reboot VM

6.  Shutdown the template/Golden Image via the NAP to set as image 

Your image should now have the Win10 2004/20H2 update installed

Please note that there have been some known sysprep errors regarding Microsoft packages and the 2004 update.  Please see this thread for details if you run into a sysprep error setting your image:

https://answers.microsoft.com/en-us/windows/forum/all/sysprep-not-working-anymore-on-win10-2004/d284b8c6-e18d-41df-a402-153a0ecf3ee6

Here's a summary of those steps from the link above that can be run on your template if you are running into a sysprep error, PLEASE VERIFY A BACKUP HAS BEEN TAKEN OF YOUR TEMPLATE OR GOLDEN IMAGE:

1.  Download the AppxDBEditor tool to the Template/Golden Image to C:\temp and extract this
        -  https://github.com/SoftSonic83/AppxDBEditor/
2.   Edit the AppxDBditor AppxPackageList.txt to target the following packages:
     # Modern UI Dialog-App for entering Japanese Characters
     InputApp=0

     # App to project the Screen to a Wireless Display
     Microsoft.PPIProjection=0

     # Cortana
     Microsoft.Windows.Cortana=0

3.  Run the AppxDBEditor.cmd
    -  "M" is the option to modify these packages

4. Open a powershell command line as administrator
5. Run the following to remove the packages:

6.  From that same command prompt check for these packages to ensure they are no longer present via this command:

Get-AppxPackage -AllUsers | where-object {$_.Name -like "*cortana*" -or $_.Name -like "*ppip*" -or $_.Name -like "*input*"} | Select name | sort name

7.  Power down template to set as image.