Windows 11 Cumulative Update KB5008215 for December 2021

Microsoft has released KB5008215 for Windows 11 to the stable channel as part of its Patch Tuesday for December 2021. Since this is a “cumulative” update, it includes new security improvements as well as the previous non-security improvements released over the months.

We suggest that you upgrade to this release using the guide given below in this post if you are already using Windows 11. If not, upgrade to Windows 11 now! Check whether your PC meets the minimum hardware requirements for it. If not, you can also install Windows 11 while bypassing system checks.

Installing KB5008215 will upgrade your OS build to 22000.376. You can check your OS version and build by typing in winver in Run.

Let us now continue to see what KB5008215 improves and whether it has any issues you ought to be aware of.

Fixes and Improvements

This update includes quality improvements for the Servicing Stack (SSU), which is responsible for installing the Windows updates. These improvements ensure that the user has a smooth experience while installing these updates.

Microsoft has also made a few security updates to the internal operating system functionality.

If you have not installed Windows updates for the month of November 2021, then you will also experience the improvements made in those. You can read all about those improvements in the following updates:

Furthermore, there are currently no known issues for this update.

Download and Install KB5008215

Offline Installer

Download KB5008215 for Windows 11 64-Bit [220.5 MB]

Download KB5008215 for Windows 11 for ARM64 Systems [272.1 MB]

To install the update, simply run the downloaded MSU file and Windows will automatically install the update. To download any other updates related to any of the above, please check the Microsoft Catalog.

Windows Update

To install this update via Windows Update, you need to be running Windows 11. To check your version of the operating system, type in winver in Run and press Enter.

Download and install Windows 11, or check if your system meets minimum hardware requirements for Windows 11.

To install KB5008215, open the Settings app and click Windows Update on the left. You will then see the following written in the right-hand pane:

2021-12 Cumulative Update for Windows 11 for x64-based Systems (KB5008215)

The update will begin downloading automatically. When it does, click Install now.

Install now 1
Install KB5008215

Once installed, click Restart now to finalize the installation.

restart now 3
Reboot PC to finalize KB008215 installation

When the computer reboots, you can confirm that the update has been installed successfully through winver.

updated 5
KB5008215 successfully installed on Windows 11

Rollback/Remove Windows 11 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 roll back after 10 days, you will need to apply this trick.

Cleanup after installing Windows Updates

If you want to save space after installing Windows updates, you can run the following commands one after the other in Command Prompt with administrative privileges:

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

Also see:

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