Windows 10 Version 21H1 Build 19043.899 for Beta Channel Released

Microsoft has released another update to the Beta channel for Insiders. If you are subscribed to the channel, you will receive an update for your Windows 10 v21H1, KB5000842. This update can be installed through Windows Update.

The release does not include any new features, but a number of other fixes for the OS. This release was made a week after the last update for 21H1. Installing this update will upgrade your OS build to 19043.899.

Windows 10 Version 21H1 Build 19043 899
Windows 10 Version 21H1 Build 19043 899

Let us continue to see what has improved with this release in Windows 10.

What’s new in KB5000842 (19043.899)

Improvements and fixes

As we mentioned, this update does not include any new features. It does however include a number of fixes that will improve the user experience. Let’s see what those are:

  • An issue with Zoom while using Microsoft Edge IE Mode on devices with high DPI monitors has been fixed.
  • Administrators can now enable a Group Policy Object to extend keyboard shortcuts in Microsoft Edge IE Mode, such as Ctrl + S, etc.
  • The problem with the Toast collection icon in the Action Center preventing it from appearing has been fixed.
  • An issue resulting in High Dynamic Range (HDR) display devices appearing much darker than expected has been addressed.
  • The issue with video playback not in sync on multiple monitors has been fixed.
  • An issue that may cause applications to stop working while typing Japanese characters using the Microsoft Japanese Input Method Editor (IME) in compatibility mode has been addressed.
  • The issue with the device not responding during the hybrid shutdown has been fixed.
  • The issue of some users being unable to adjust or close the touchpad due to some administrative settings has been addressed.
  • A window rendering issue where the content would often flicker while using FlipEx or multi-plane overlay (MPO) has been taken care of.
  • An issue with Japanese input that occurs after changing focus between boxes in Microsoft Edge has been fixed.
  • The problem with the File Explorer’s search results has been fixed that resulted in no results or kept displaying “computing filters” indefinitely.
  • The problem with the touch keyboard making the split-view unavailable when rotating a device to portrait mode has been fixed.
  • Parents will now be notified when a child’s account in the Family Safety Plan has administrative privileges.
  • An issue preventing some users from closing the Toast Notification from the Close Button on touchscreen devices has been addressed.
  • Heap leak issue causing explorer.exe to consume high amounts of RAM has been fixed.
  • The Volgograd, Russia time zone has been updated from UTC+4 to UTC+3.
  • A new time zone has been added: UTC+2:00 Juba, for the Republic of South Sudan.
  • An issue with the Windows Event Log Forwarding client has been addressed, which previously returned the first matching certificate without checking private key permissions.
  • The problem that caused PowerShell-based monitors to stop working after enabling transcription has been addressed.
  • An issue that stops BranchCache from working after activating Windows using Cloud Solution Provider (CSP) license has been taken care of.
  • A problem that prevents Windows 10 Home edition devices from upgrading to Pro Education edition using Mobile Device Management (MDM) has been fixed.
  • An issue that prevents App-V applications from opening and throwing bugchecks 0xc0000225 has been fixed.
  • The problem with some computers enrolled with an MDM service failing to sync if the device manufacturer’s name contains a reserved character has been addressed.
  • The issue of custom settings failing to take effect when using a Configuration Service Provider (CSP) policy to configure a custom setting for Audit Other Logon/Logoff events has been fixed.
  • The problem resulting in the system not working and generating an error code c0000005 when Trusted Platform Module (TPM) is enabled has been fixed.
  • The problem with multiple .exe instances running when AppLocker is enabled has been addressed.
  • The issue with credential roaming when Windows Hello for Business is enabled has been fixed.
  • An issue that prevents performance monitoring tools from displaying logged data for single instance counter objects has been addressed.
  • An issue that sometimes prevents Chromium-based Microsoft Edge from working has been resolved.
  • An issue that may cause a black screen or delay signing in to computers joined with Hybrid Azure Active Directory (AAD) has been fixed.
  • A problem generating the stop code 0xC9 and stopping the system from working has been fixed.
  • The problem with the 7.1 channel audio has been fixed.
  • The issue with the Caps Lock unexpectedly turning on while using RemoteApp has been addressed.
  • Windows will now retrieve updated printer capabilities so users have the proper set of selectable printing devices.
  • Support for hole punch and stapling locations for print jobs with long edge first paper feed directions on certain printers has been added.
  • A problem resulting in high memory usage while performing XSLT transforms using MSXLM6 has been fixed.
  • An issue with some applications to stop responding entirely has been addressed.
  • An issue that prevents Server Message Block 1 (SMB1) clients from accessing the SMB share after restarting the LanmanServer service has been fixed.
  • A problem that may sometimes cause the cluster network interface to stop working for a short time has been fixed.
  • An issue with signing in to a device that is in the current domain using the default user profile of a device that is in a different but trusted domain has been addressed.
  • The issue with the device not responding after deleting files or folders that have been synced with OneDrive has been fixed.
  • An issue that prevents the Windows 10 version 2004 from activating using the OA 3.0 key after installing KB4598291 has been fixed.
  • The problem with evaluating the compatibility status of the Windows ecosystem to help ensure application and device compatibility for all updates to Windows has been fixed.
  • Support for the legacy Microsoft Edge has been removed and the new Chromium-based Edge will be automatically installed.
  • The issue of users being unable to connect to a Windows Server 2019 in Desktop Experience mode using Remote Desktop Protocol (RDP) has been addressed.
  • The issue has been fixed to allow Microsoft’s enterprise partners to work with the Microsoft Support program to create customized mitigations.
  • An issue that occasionally caused a Blue Screen of Death (BSoD) when attempting to print to certain printers using some apps and might generate the error APC_INDEX_MISMATCH has been fixed.
  • The problem with the HTTP Keep-Alive connection in Azure Front Door has been fixed.
  • An issue that causes Remote Desktop sessions to end unexpectedly has been fixed.

How to upgrade to Windows 10 21H1 Build 19043.899

Make sure that you are on a Beta channel and then follow the instructions below to install this update on your computer. To join the Beta channel, follow the guide to join the Windows Insider Program.

To install this update using Windows Update, please go to Start Menu –> Settings –> Update & Security –> Windows Update. In the right-hand pane, click on the Check for updates button. You will then be able to see the update and should install it automatically.


Rollback/remove Windows 10 Insider Preview update

If you do not wish to keep the installed preview update for some reason, you can always roll back to the previous build of the OS. However, this can only be performed within the next 10 days after installing the new update.

To rollback after 10 days, you will need to apply this trick.

You can also resort to uninstalling the update using the method below.

Uninstall KB5000842 using command-line

Since we have installed this update using Windows Update, it will not be listed in the list of updates but you can see it in the command line:

  1. Open Command Prompt (Run –> cmd)
  2. Run the following command:
    wmic qfe list brief /format:table
  3. This will show all the updates installed on the computer. Make sure the relevant updates are on the list.
  4. To uninstall the update, run the following command
    wusa /uninstall /kb:5000842

Restart your computer once the update is uninstalled.

Cleanup after installing Windows Updates

If you want to save space after installing Windows updates, you can run the following commands:

dism.exe /Online /Cleanup-Image /AnalyzeComponentStore
dism.exe /Online /Cleanup-Image /StartComponentCleanup

Subhan Zafar

Subhan holds a degree in Electrical Engineering and has completed several system and network certifications including Huwaei, Cisco and Microsoft certs. He mostly researches and writes about the Windows world.

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