Windows 11 build 25921

Build of Gallium
OS familyWindows 11 (NT 10.0)
Version number10.0
Build number25921
Build revision1000
ArchitectureAMD64, ARM64
Build labrs_prerelease
Compiled on2023-07-28
Expiration date
Timebomb2023-09-15 (+49 days)
Home (N, Single Language, China)
SE (N)
Pro (N, Single Language, China)
Pro Education (N)
Pro for Workstations (N)
Education (N)
Enterprise (Evaluation, G, GN, N, N Evaluation)
IoT Enterprise
About dialog

Windows 11 build 25921 is the third Insider Preview and the first available server build of Gallium, the 24H1 development semester of Windows as a service. It was released to Windows Insiders in the Canary Channel on 4 August 2023, along with its server counterpart.

New features and changes[edit | edit source]

Shell[edit | edit source]

  • The support of JPEG XR high dynamic range (HDR) wallpaper on HDR displays, previously available in build 25915, has been rolled out to all users.
  • The redesigned preview tooltip when hovering over a file in the Start menu's Recommended section, initially implemented in build 25905, has been rolled out to users on AAD-joined devices.
  • The redesigned Share flyout, initially implemented in build 23506, has been ported to this build.

Settings[edit | edit source]

  • The updated icon for the Dynamic Lighting option under the Personalization page, initially implemented in build 23506, has been ported to this build.
  • The "Spotlight activity" option under Privacy & security > Microphone, initially implemented in build 25905, has been removed.
  • Several options for tuning intensity and color boost have been added to the color filters via Accessibility > Color Filters.

Miscellaneous[edit | edit source]

  • Starting from this build, Cortana can be uninstalled manually.
  • The asynchronous error-handling feature has been implemented to the DHCP client service, thus improving the response time for the ipconfig /renew command.

Bugs and quirks[edit | edit source]

  • Adjusting screen brightness may not work on some laptops.
  • The Safely Remove Hardware icon in the system tray on the taskbar may sometimes disappear.
  • The icons on the desktop may appear blank in certain cases. Refreshing the desktop would resolve this issue.
  • Devices with mobile broadband connectivity may not be able connect to a wireless network due to an issue in which the APN configuration may get lost after upgrading to this build.
  • Task Manager may fail to open on some locales.
  • explorer.exe may throw an Unknown Hard Error error and get stuck in a crash loop when logging in to Safe mode, due to the 0xc0000005 (ACCESS_VIOLATION) exception with faulting module HolographicExtensions.dll.

Gallery[edit | edit source]

External links[edit | edit source]