Insider KB5124010 Windows 11 Insider RP build 26100.9539 (24H2), 26200.9539 (25H2), and 26300.9539 (26H2) - Sept. 10



 Windows Insider Blog:

Hello Windows Insiders,

These release notes are for Windows 11 Builds 26100.9539, 26200.9539 and 26300.9539 (KB5124010) in the Release Preview Channel on Windows 11, versions 24H2 (Build 26100), 25H2 (Build 26200) and 26H2 (Build 26300).

This update is available through two release phases: gradual rollout and normal rollout. A gradual rollout  delivers an update in phases, so features reach devices over time instead of all at once, meaning availability varies by device. A normal rollout  is the broad release to all eligible devices at the same time, usually when it reaches general availability (GA).

Gradual rollout

This section highlights some new features and enhancements for Windows 11 PCs, including AI-powered capabilities, continuous innovation, and performance improvements.

File Explorer
  • New! This update adjusts how the preview pane handles files downloaded from the web. For HTML files, a new Preview anyway button lets you acknowledge the warning and preview the file. Non-HTML files, such as PDFs, are now previewed automatically.
  • New! File Explorer Home now preserves the state of sections (expanded or collapsed), so you can pick up where you left off.
  • New! This update improves the reliability of thumbnail previews for cloud files in the Details pane. The pane has also been reorganized so file properties are easier to find and review at a glance.
  • New! The update addresses an issue that could clear the address bar contents when entering edit mode by clicking near the right side of the address bar.
Emoji
  • New! This update adds support for Emoji 17.0, including new emoji such as distorted face, fight cloud, and hairy creature. To insert them, press the Windows key + Period (.) to open the emoji panel.
  • New! This update also refines the design of several existing emoji for better consistency across platforms, including saluting face, face with peeking eye, goose, lotus, and kissing cat.

Widgets
  • New! This update introduces the Tips widget, which provides short, helpful guidance about Windows features. To add it to your Widgets board, open the board, select Add widgets, and then choose Tips. To add it to your lock screen, go to Settings > Personalization > Lock screen and add Tips to your lock screen widgets.

Personalization
  • This update includes a variety of improvements to desktop background experiences.
  • This update improves the reliability of the Personalization > Background page in Settings.
  • This update adds support for using DIB image files as desktop backgrounds.
  • This update improves reliability of desktop slideshow transitions on newly created accounts.
  • This update improves resolution of previews when selecting a desktop background in Personalization > Background.
  • This update improves desktop background preview display in Settings for users with portrait mode monitors.
  • This update improves reliability of processing desktop wallpaper changes when they happen in quick succession.
  • This update adds support for using slideshow wallpapers with multiple desktops, so that it won’t automatically switch you back to Picture.

Bluetooth
  • This update contains several enhancements to improve reliability and experience when connecting to and using Bluetooth devices:
  • During voice calls, the Windows shell volume flyout now appears when adjusting the volume of a Bluetooth Classic Audio accessory via the volume controls on the accessory, providing visual feedback of the new volume level.
  • This update improves the accuracy of the connection state displayed by Windows for accessories that have disconnected from the PC.
  • This update improves stability of the Bluetooth and devices page in Settings when managing Bluetooth and audio devices.
  • This update resolves an issue where the Bluetooth radio could be turned off, but the state of the radio control toggle in the Bluetooth and devices page in Settings shows as on.
  • This update improves Bluetooth audio stability and compatibility.
  • This update improves microphone compatibility with certain Bluetooth Classic audio accessories.
  • This update resolves an issue that could result in a crash (error code 0x139) while streaming Bluetooth audio.
  • This update improves reliability and performance with LE Audio accessories.
  • This update improves the reliability of shared audio.
Accessibility
  • New! This update introduces Open apps maximized, an accessibility setting that automatically maximizes app windows as they open. It removes a bit of everyday friction whether you use a screen reader or magnification, work in tablet mode, or simply prefer a consistent, full-screen workspace. To turn it on, go to Settings > Accessibility > Visual effects and turn on Open apps maximized.

  • This update improves navigation of the Bluetooth quick settings page when using keyboard input, gamepad input, or Narrator.
Magnifier
  • New! This update brings a modernized visual refresh to the Magnifier taskbar.
  • Updated icons. Magnifier’s toolbar icons align with Windows 11 visual design, giving the tool a cleaner, more modernized feel.
  • Refined spacing and padding. The padding is adjusted with spacing across the toolbar for a more polished, consistent layout.
  • Views, zoom controls, keyboard shortcuts, and Read Aloud all behave exactly as they did in earlier versions.
Settings
  • This update improves the reliability of Settings when interacting with the contents of the Settings > Bluetooth & Devices > Printers & Scanners page.
  • This update updates Settings > Apps > Installed apps to show the version number at the top level for packaged apps, as it already does for other apps.

  • This update improves the time picker control in Settings so that it reflects your preferred time format when you switch between 12-hour and 24-hour. This applies in places such as setting active hours and scheduling night light.
  • This update improves persistence of the Allow multiple apps to use camera at the same time option in Settings > Bluetooth & Devices > Camera settings.

Touchpad
  • New! Additional gesture controls for precision touchpads are available in Settings > Bluetooth & devices > Touchpad:
  • Single-finger scrolling — Scroll vertically with one finger starting from the left or right side of the touchpad.

  • Automatic scrolling — Keep scrolling without lifting your fingers by moving them near the edge of your touchpad while scrolling.

  • Previously, gesture controls for scroll and zoom speed and accelerate scrolling were released in the July 2026 update (KB5101684).

Copilot key
  • New! This update introduces a new Windows 11 setting that lets you remap the Copilot key to function as the Right Ctrl or Context Menu key, helping preserve familiar keyboard shortcuts and accessibility workflows. For more information, see Understand updates to the Copilot key on Windows devices.

Cameral roll
  • New! This update introduces Camera roll backup in Settings, helping eligible users protect their photos with OneDrive. You can turn on the feature from the Settings Home or Accounts page and complete setup on their mobile phone using a QR code. 1
Fonts
  • New! This update adds support for the Garay and Beria Erfe scripts to the Ebrima font, the first Microsoft font to support both. Garay was encoded in Unicode 16.0 and Beria Erfe in Unicode 17.0.
  • New! This update also refines the Adlam glyph designs in Ebrima to align with the current Unicode standard and improve consistency.
Windows Recovery (WinRE)
  • New! This update enables WinRE to automatically reuse eligible Wi-Fi profiles already saved in Windows, including supported certificate-based networks. Devices can now get online automatically during recovery scenarios such as quick machine recovery or cloud rebuild, without preconfiguring Wi-Fi credentials in WinRE. This capability is on by default, and IT admins can disable it. For more information, see Windows Recovery Environment (Windows RE).
  • New! This update adds recovery remote management plug-in for extending WinRE management capabilities for MDM providers. For more information, see Recovery Remote Management Overview.
Kiosk mode
  • The Windows key plus Tab keyboard shortcut is now disabled when using a restricted UX kiosk.
  • The Windows key plus A and Windows key plus C keyboard shortcuts are now disabled when using single app kiosk mode.
Windows Backup 
  • PC-to-PC Migration is no longer available. This feature, introduced through a phased rollout, previously allowed you to transfer files and settings directly from your previous PC when setting up a new Windows PC. To back up and restore your files, settings, and other supported items when moving to a new PC, use Windows Backup. For more information, see Back up and restore with Windows Backup.

1 Feature availability depends on your device and market.


 Source:



Check Windows Updates


UUP Dump:

64-bit ISO download:

ARM64 ISO download:

 
Last edited:
Installed without issues
 

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I had some trouble with the new context menu reverting back to the classic context. It was the registry entry I made to get the classic context menu a long time ago. Removed it and everything is file.

Also, somehow dism ... /scanhealth is clean now (it wasn't after this update). I didn't do anything - I reckon it was a server side issue and they fixed it.
 

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Got new context menus back. But lost Dark Run and Dark Folder Options. Anyone with new Vivetool IDs ?

Me too. And the registry entries to enable "modern run" no longer work. Why is this even a roll out feature? It must not be that complicated, - it worked - so why isn't it in a monthly security update rather than a phased rollout?
 

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Me too. And the registry entries to enable "modern run" no longer work. Why is this even a roll out feature? It must not be that complicated, - it worked - so why isn't it in a monthly security update rather than a phased rollout?
Modern Run is still in development. It's not ready for RP yet.
 

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Modern Run is still in development. It's not ready for RP yet.

I had it in experimental then switched to RP and had it for a while I believe (with the enabling registry entries). 🤷‍♂️
 

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If you have experience removing/adding certificates in BIOS, you can reset only the DBX Management database. This action will clear SVN credentials to disable the Windows SVN mechanism.

Currently, Microsoft is not enforcing the Windows SVN policy, this is an optional step.

Any request for you to apply SVN policies could be malicious. Do not manually execute SVN policies without understanding their function.
Thanks for your comments. They are appreciated and noted.

My point in my post above was, I wanted to note that Windows Update increased the SVN of the Windows files but it did not update the SVN of the UEFI firmware. I do not know if it must have updated the SVN of the firmware as well or was it a glitch of the update process.

I updated SVN of UEFI firmware aftter running @garlin 's check script and following the comments in the Audit section.

Therefore, if Windows users want to keep their Windows installations current as regards Secure Boot, they must keep this in mind that Windows Update does not update UEFI firmware SVN. Periodic check of Windows installations after Windows Update by @garlin 's Secure Boot status check will be helpful.

Regarding my two Windows installations, I disabled secure boot temporarily in BIOS and updated the other Windows installation. After that, enabling Secure Boot put my system back to its previous secure state, whether Secure Boot does its job well or not.
 

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The Secure Boot update task runs every 12 hours, or 5 min. after a reboot.

It checks if there's a new SVN available in the DBXUpdateSVN.bin file. The first step is to deploy a new Windows boot manager (with the newest SVN) to the EFI. The update task will not force a reboot, it will patiently wait until some other Windows process (or the user) orders a reboot. When the task runs again on reboot, it finds there is a new boot manager running so it's allowed to change the SVN.

The DBX SVN is updated, but the task wants one more reboot to confirm the SVN is being enforced.

This process can happen in parallel with the usual Monthly Updates. The task doesn't force a reboot, but waits for Windows Update to reboot the system as part of the normal maintenance. When you have a SVN update, Windows will reboot three times instead of the usual two times.

When SVN and boot manager updates don't happen, it could by caused by the task being disabled/removed or a safety check blocks the task from proceeding.
 

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@uncyler825 why u no longer update the GitHub with the gradual rollouts :(
 

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