Microsoft has pushed out KB5124010, the September 2026 optional preview update for Windows 11 24H2 and 25H2. It contains 46 changes, including Bluetooth fixes, a way to remap the Copilot key, and support for Emoji 17.0.

The release is a non-security update. Monthly preview updates like this one give administrators and users an early look at fixes and features that will reach all devices with next month's Patch Tuesday, the regular monthly release of Windows security and quality updates. Unlike the cumulative updates shipped on Patch Tuesday, previews such as KB5124010 contain only quality improvements. They do not patch security vulnerabilities.

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Microsoft has confirmed that recent Windows 11 updates are stopping the desktop from loading on some systems. Affected users see a black screen after signing in.

The problem started with the August 2026 preview updates and carried into later releases, including this month's Patch Tuesday rollout. According to Microsoft, it mainly hits Azure Virtual Desktop (AVD) hosts that use FSLogix. AVD is Microsoft's cloud-based desktop and app virtualization service. FSLogix is a tool that speeds up the loading of user profiles in virtual desktop environments.

Which updates are involved

Microsoft lists the following updates as linked to the issue:

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