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Windows 10 22H2 Windows 10 22H2 Optional preview
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KB5066198

KB5066198: Cumulative update for Windows 10, version 22H2, September 2025. SMBv1 file sharing and Autopilot enrollment issues fixed

In short

Fixes SMBv1 file-sharing connection problems and an Autopilot enrollment page that could fail to load. Windows 10 support ended October 14, 2025.

Does it affect you? Applies to: Devices running Windows 10, version 22H2.

Build
19045.6396
Restart
Required

Microsoft publishes separate notes for this KB for Windows 11.

What changes

Fixes 2 changes

SMBv1 protocol connectivity

  • Connections to shared files and folders work again when using SMBv1 over NetBIOS over TCP/IP.1
    Fixes a connection issue that could occur after installing KB5065429.

Autopilot Enrollment Status Page (ESP)

  • The Enrollment Status Page loads during Autopilot setup instead of failing to load during the Out-of-Box Experience.2
    Fixes the issue when Windows Autopilot deploys Windows 10, version 22H2, to devices with the Enrollment Status Page configured.

Improvement 1 change

Servicing stack

  • The component that installs Windows updates gets quality improvements intended to make the update process more reliable.3
    Includes servicing stack update KB5066411, build 19045.6389, combined with the latest cumulative update.

Technical details

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

Data sheet

Released
2025-09-25
Classification
Updates
Type
Cumulative update
Restart
Required
Replaces
KB5065429, KB5063842, KB5066188, KB5063709
+22 earlier KB5062649, KB5062554, KB5061087, KB5063159, KB5058481, KB5061979, KB5061768, KB5055612, KB5053643, KB5052077, KB5050081, KB5046714, KB5045594, KB5043131, KB5041582, KB5040525, KB5039299, KB5037849, KB5036979, KB5035941, KB5034843, KB5034203
Replaced by
KB5066791
VersionBuildChannel
22H2 19045.6396 General availability

Security

No vulnerabilities are listed for this update.

Updated components

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

Top changed componentsFiles
Settings15
File Explorer and shell13
Graphics and display11
Security and sign-in7
Hyper-V and virtualization4
Kernel4
Remote Desktop4
Secure Boot4
Storage and file systems3
Emoji and input2
Networking2
Audio1

Sources

Updated
Cited passages from Microsoft's official notes (3)
  1. 1. Fixed: An issue where you might not be able to connect to shared files and folders if you're using the Server Message Block (SMB) v1 protocol on NetBIOS over TCP/IP NetBIOS support.microsoft.com
  2. 2. Fixed: An issue when using Windows Autopilot to deploy Windows 10, version 22H2 to devices with the Enrollment Status Page (ESP) configured might find that the ESP doesn't load during the Out-of-Box Experience (OOBE). support.microsoft.com
  3. 3. This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. 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 3/5, completeness 5/5. 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