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KB5122883: Safe OS Dynamic Update for Windows Server 2025: September 8, 2026

Applies To

Windows Server 2025

Summary

This update makes improvements to the Windows recovery environment (WinRE).

How to get this update

Install this update

To install this update, use one of the following release channels.

Available	Next step
	This update is available through Windows Update. It will be downloaded and installed automatically.

Available	Next step
	To get the standalone package for this update, go to the Microsoft Update Catalog website. To download updates from the Update Catalog, see Steps to download updates from the Windows Update Catalog. To manually install this update, see Add an update package to Windows RE.

About this update

Item	Details
Prerequisites	There are no prerequisites to apply this update.
Restart information	You do not have to restart your device after you apply this update.
Removal information	This update cannot be removed once it is applied to a Windows image.
Update replacement information	This update replaces the previously released update KB55120244.
Verify the installation of this update	After installing this update, the WinRE version installed on the device should be 10.0.26100.33435. To find the WinRE version installed, see Methods to verify the WinRE version installed.
File information	A list of the files that are included in this update is provided in a CSV (comma-delimited) file. The file can be opened in a text editor such as Notepad or in Microsoft Excel. Note The English (United States) version of this software update might contain files for additional languages. Download the file information for update KB5122883.

References

Description of the standard terminology that is used to describe Microsoft software updates

Query words: safeos du