Microsoft fixes Windows 11 update bug that reset desktop and mouse settings
Summary
Microsoft says KB5124008 and later updates fix a Windows 11 24H2 and 25H2 bug triggered by KB5120998 that reset desktop and mouse settings, including turning wallpapers black.
Key points
- The issue affected Windows 11 24H2 and 25H2 devices after installing the KB5120998 August 2026 preview update.
- Desktop backgrounds could become solid black, and manually restoring customized settings did not work.
- The update also changed or reset mouse settings.
- Microsoft says KB5124008, released September 8, 2026, and later updates resolve the issue and recommends installing the latest security update.
- KB5120998 was optional, but could install automatically for users who enabled the option to get the latest updates as soon as they are available.
Article Details
- Event Type
- Microsoft resolved a Windows 11 update bug that reset desktop and mouse settings.
- Impact
- After installing KB5120998, some Windows 11 24H2 and 25H2 devices displayed a solid black desktop background, and customized desktop and mouse settings could not be restored. Microsoft said KB5124008 and later updates resolve the issue.
Vendors
Products
KB5120998Microsoft says the September 2026 Patch Tuesday updates fix a bug that caused some Windows 11 devices to lose desktop settings and display a black wallpaper after installing KB5120998.KB5124008The company confirmed the issue also affected mouse settings and advised users to install KB5124008 or later to resolve it.Windows 11Microsoft says the September 2026 Patch Tuesday updates fix a bug that caused some Windows 11 devices to lose desktop settings and display a black wallpaper after installing KB5120998.