Skip to the content
The Update Bureau
Windows 11 24H2 Windows 11 24H2 Out-of-band update
Out-of-band

KB5043178

KB5043178: Cumulative update for Windows 11, version 24H2, September 2024. Energy-saving controls arrive; Roblox remains unavailable on Arm

In short

Adds energy-saving and interface features and fixes several setup, accessibility, and app issues. Roblox still cannot be downloaded from the Microsoft Store on Arm devices, but players can get it directly from Roblox.com.

Does it affect you? Applies to: Devices running Windows 11, version 24H2. This version targets Copilot+ PCs and devices that previously used Windows Insider 24H2 builds.

Build
26100.1882
Restart
Required
Review notes Additional details from the official release notes (1) Read note
  • This page On Arm devices, players cannot download and play Roblox through the Microsoft Store. They can play it by downloading it directly from Roblox.com.

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

What changes

New features 7 changes

Settings

Gradual rollout
  • An energy recommendation can suggest turning off HDR to conserve energy on devices with HDR displays.1
    Find it at Settings > Power & battery > Energy recommendations.

Battery life

Gradual rollout

For: devices with Energy Saver set to “Always On”

  • When the battery reaches 20%, a notification says that Windows is helping reduce power use if Energy Saver is set to “Always On.”2

Start menu

Gradual rollout
  • The account manager adds a Sign out option and a list of other users to make switching accounts easier.3
    Select the ellipses (...) in the account manager to see other users.

Taskbar

Gradual rollout
  • You can share local files directly from search results in the taskbar search box.4

Lock screen

Gradual rollout
  • Media controls appear in the lower center of the lock screen while media is playing.5

Mouse

Gradual rollout
  • Settings adds options to turn off enhanced pointer precision and change the direction of mouse scrolling.6
    Find the options at Settings > Bluetooth & Devices > Mouse.

Copilot Pro subscription

For: Copilot Pro subscribers

  • You can manage your Copilot Pro subscription in Settings after signing in to your Microsoft account.7
    Go to Settings > Accounts.

Fixes 7 changes

Screen readers

For: screen reader users

  • Screen readers can narrate screen content from some apps that run with administrator privileges.8
    The issue affected NVDA and other screen readers.

Setup

2 items
  • After you select Japanese or Korean as the keyboard type during setup, the keyboard no longer switches to English.9
  • Text in some parts of the setup interface appears in the correct language.10

Input Method Editor (IME)

For: devices using a combo box with input focus

  • Closing a window no longer causes a memory leak when a combo box has input focus.11

WebView2 apps

For: people using WebView2 apps with Xbox 360 or Bluetooth controllers

  • WebView2 apps detect input from Xbox 360 and Bluetooth controllers.12

Task Manager

2 items
  • The Settings page no longer has a white background when it should not.13
  • Task Manager no longer stops responding when you switch from a high contrast theme to a normal theme.14

Improvements 2 changes

Open Source Software

  • Credits files now include attributions for Rust open-source software components.15
    The attributions are added to credits.txt files.

Servicing stack

  • The component that installs Windows updates receives quality improvements to help devices receive and install updates reliably.16
    The update includes servicing stack update KB5043117, version 26100.1881.

Known issues

  1. Open Affects: Everyone

    We’re aware of an issue where players on Arm devices are unable to download and play Roblox via the Microsoft Store on Windows.

    Players on Arm devices cannot download and play Roblox through the Microsoft Store on Windows.17

    How to apply the workaround Workaround

    Download Roblox directly from Roblox.com.17

Technical details

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

Data sheet

Released
2024-09-30
Classification
Updates
Type
Cumulative update
Restart
Required
Replaces
KB5043080, KB5041865, KB5041571, KB5040529
+3 earlier KB5040435, KB5039304, KB5039239
Replaced by
KB5044284
VersionBuildChannel
24H2 26100.1882 General availability

Security

No vulnerabilities are listed for this update.

Sources

Updated
Cited passages from Microsoft's official notes (17)
  1. 1. There is a new energy recommendation to turn off high dynamic range (HDR). This helps to conserve energy on devices that have HDR displays. support.microsoft.com
  2. 2. When your device's battery power is running low, a notification will appear that will inform you that "Windows is helping to reduce power consumption.". This occurs when the battery level reaches 20% and while Energy Saver is set to “Always On”. support.microsoft.com
  3. 3. The "Sign out" option is now on the account manager when you open the Start menu. To change to a different user, select the ellipses (...). A list of other users appears to make it easier to switch. support.microsoft.com
  4. 4. You can now share local files directly from the search results that appear in the Search box on the taskbar. support.microsoft.com
  5. 5. Media controls now show in the lower part of the lock screen at its center when media is playing. support.microsoft.com
  6. 6. This update adds the option to turn off enhanced mouse pointer precision to Settings > Bluetooth & Devices > Mouse. There is also a new option to change the direction in which the mouse scrolls. support.microsoft.com
  7. 7. You can now manage your Copilot Pro subscription in Settings. Sign in to your Microsoft account and go to Settings>Accounts. support.microsoft.com
  8. 8. The NonVisual Desktop Access (NVDA) app and other screen readers fail to narrate all the screen content from some apps. This occurs when those apps run with administrator privileges. support.microsoft.com
  9. 9. After you set the keyboard type to Japanese or Korean during setup, the keyboard type shows as English. Also, when you type, your device uses the English keyboard layout. support.microsoft.com
  10. 10. Some text on the setup user interface (UI) is not in the correct language. support.microsoft.com
  11. 11. When a combo box has input focus, a memory leak might occur when you close that window. support.microsoft.com
  12. 12. They do not detect input from Xbox 360 and Bluetooth controllers. support.microsoft.com
  13. 13. Its Settings page might have a white background when it should not. support.microsoft.com
  14. 14. It stops responding when you switch from a high contrast theme to a normal theme. support.microsoft.com
  15. 15. This update adds attributions to credits.txt files for Rust OSS components. support.microsoft.com
  16. 16. This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. support.microsoft.com
  17. 17. We’re aware of an issue where players on Arm devices are unable to download and play Roblox via the Microsoft Store on Windows. support.microsoft.com
Checked automatically: 8 of 8 checks passed, 17 quoted passages · compared with Microsoft's page on Oct 21, 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 4/5, clarity 4/5, 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