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Windows 11 23H2 Windows 11 23H2 Out-of-band update
Out-of-band

KB5066189

KB5066189: Cumulative update for Windows 11, version 23H2, August 2025. Reset failures addressed; MSI repair prompts listed

In short

Attempts to reset or recover a device might fail after the August security update; this optional release addresses that problem. Standard users might still see unexpected prompts during app repairs.

Does it affect you? Applies to: Devices running Windows 11, version 23H2, build 22631.5771.

Build
22631.5771
Restart
Required
Review notes Additional details from the official release notes (2) Read notes
  • What to do Microsoft recommends this optional update if you have encountered the reset or recovery issue. If your system is unaffected or you do not plan to use the listed processes, you can choose not to install it.
  • Known issues A non-admin user’s app can fail when it starts an MSI repair without displaying a window. Error 1730 is the example Microsoft gives for Office Professional Plus 2010.

The official sources are linked at the end of the page.

What changes

Improvements 2 changes

Windows 11, version 23H2

  • Includes the quality improvements from the August 12 update.1
    Includes quality improvements from KB5063874 (released August 12, 2025).

Servicing stack

  • The component that installs Windows updates gets quality improvements.2
    Includes servicing stack update KB5062686 for versions 22621.5690 and 22631.5690.

Fix 1 change

Reset and recovery

For: devices using the listed reset or recovery processes

  • Resetting or recovering a device might fail after the August 2025 security update. This release addresses the problem.3
    Applies to Reset my PC, Fix problems using Windows Update, and RemoteWipe CSP.

Known issues

  1. Open Affects: Everyone

    Unexpected User Account Control (UAC) prompt when doing MSI repair operations

    Standard users might see unexpected User Account Control prompts during app repairs and related actions. Repairs that run without showing a window might fail with Error 1730.4

    Workaround status No workaround yet

    Microsoft has not published a manual workaround for this issue yet. Monitor release health until a resolving update is available.

Technical details

Data sheet · Security · Downloads · Components Click to collapse or expand

Data sheet

Released
2025-08-19
Classification
Updates
Type
Cumulative update
Restart
Required
Replaces
KB5063875, KB5062663, KB5062552, KB5060826
+36 earlier KB5060999, KB5062170, KB5058502, KB5058405, KB5055629, KB5058919, KB5055528, KB5053657, KB5053602, KB5052094, KB5051989, KB5050092, KB5050021, KB5048685, KB5046732, KB5046633, KB5044380, KB5044285, KB5043145, KB5043076, KB5041587, KB5041585, KB5040527, KB5040442, KB5039302, KB5039212, KB5037853, KB5037771, KB5036980, KB5036893, KB5035942, KB5035853, KB5034848, KB5034765, KB5034204, KB5034123
Replaced by
KB5065431
VersionBuildChannel
23H2 22631.5771 General availability

Security

No vulnerabilities are listed for this update.

Updated components

216 files changed since the previous update for the same versions.

Top changed componentsFiles
Kernel3
File Explorer and shell2
Hyper-V and virtualization2
Secure Boot2
Security and sign-in2
Remote Desktop1

Sources

Updated
Cited passages from Microsoft's official notes (4)
  1. 1. This non-security update includes quality improvements from KB5063874 (released August 12, 2025). support.microsoft.com
  2. 2. This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. support.microsoft.com
  3. 3. This update addresses an issue introduced by the August 2025 security update (KB5063874), in which attempts to reset or recover the device might fail. support.microsoft.com
  4. 4. After installing the update, standard users might see a User Account Control (UAC) prompt in several scenarios. support.microsoft.com
Checked automatically: 8 of 8 checks passed, 4 quoted passages · compared with Microsoft's page on Oct 20, 2026
  • Quotes found in the official pages: passed
  • Numbers found in the sources: passed
  • Vulnerabilities from the dossier only: passed
  • Links to allowed domains only: passed
  • Every official change covered: passed
  • Readable plain text: passed
  • Changes confirmed by the file list: passed
  • Sources agree: passed

A second AI read the text against the sources: correctness 3/5, clarity 4/5, completeness 4/5. How we work

Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake