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Windows 10 1809 Windows 10 1809 Out-of-band update
Out-of-band

KB5066187

KB5066187: Cumulative update for Windows 10, version 1809, August 2025. Reset and recovery failures addressed

In short

Addresses failures when resetting or recovering Windows 10 version 1809 devices after the August security update. It is intended for affected devices and is available from the Update Catalog.

Does it affect you? Applies to: Devices running Windows 10 Enterprise LTSC 2019, Windows 10 IoT Enterprise LTSC 2019, or Windows 10 IoT Core LTSC, version 1809.

Build
17763.7683
Restart
Required
Review notes Additional details from the official release notes (1) Read note
  • In detail The KB page says Windows 10 support ended on October 14, 2025. The dossier lists support for Windows 10 version 1809 editions through January 9, 2029.

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

Microsoft publishes separate notes for this KB for Windows Server.

What changes

Fix 1 change

Fix for reset and recovery issue

For: Devices using reset or recovery methods

  • Addresses failures when resetting or recovering the device using the Windows recovery options or RemoteWipe CSP.1
    The issue was introduced by KB5063877 and affects Reset my PC, Fix problems using Windows Update, and RemoteWipe CSP.

Improvement 1 change

Servicing stack

  • The component that installs Windows updates receives quality improvements.2
    The combined update includes servicing stack update KB5062800, build 17763.7557.

Known issues

  1. Resolved Affects: Everyone Resolved by KB5065428

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

    Standard users might see an unexpected User Account Control (UAC) prompt during Windows Installer (MSI) repair and related operations. Updates released on and after September 9, 2025, including KB5065428, resolve this issue.3

    Resolution Fixed in KB5065428

    Install KB5065428 (or a later cumulative update) on affected devices. No manual workaround is required after updating.

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
KB5063877, KB5062557, KB5060531, KB5061978
+5 earlier KB5058392, KB5059091, KB5058922, KB5050008, KB5037425
Replaced by
KB5065428
VersionBuildChannel
1809 17763.7683 General availability

Security

No vulnerabilities are listed for this update.

Updated components

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

Top changed componentsFiles
Secure Boot6
Kernel4
Hyper-V and virtualization2

Sources

Updated
Cited passages from Microsoft's official notes (3)
  1. 1. This update addresses an issue introduced by the August 2025 security update (KB5063877) in which attempts to reset and recover the device fails. 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 issue is resolved by Windows updates released on and after September 9, 2025 (KB5065428). support.microsoft.com
Checked automatically: 8 of 8 checks passed, 3 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 5/5, clarity 4/5, completeness 3/5. 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