Microsoft has just rolled out its latest preview update for Windows 11, dubbed KB5124010. This optional non-security update brings a whopping 46 changes and fixes to the operating system, including improvements to Bluetooth connectivity and a long-awaited feature that lets users remap the Copilot key.
The September 2026 preview update is designed to let administrators and users test out new features and quality improvements before they become generally available in next month’s Patch Tuesday release. However, unlike regular cumulative updates, this optional update doesn’t include any security fixes – it’s all about refining the user experience.
One of the most significant changes in KB5124010 is the addition of support for Emoji 17.0, which brings a fresh batch of colorful and expressive emojis to Windows users. The update also introduces an “Open apps maximized” accessibility setting that automatically maximizes app windows as they open – a feature that’s sure to be appreciated by users with visual impairments.
Bluetooth enthusiasts will be pleased to know that the September 2026 preview update resolves several issues related to Bluetooth connectivity. For instance, Microsoft has fixed a bug that could cause crashes with error code 0x139 while streaming Bluetooth audio, as well as improved microphone compatibility with certain Bluetooth Classic audio accessories and LE Audio devices.
Another notable change is the ability to remap the Copilot key on Windows devices. Users can now configure this key to function as the Right Ctrl or Context Menu key in Settings – a feature that’s been requested by many users for quite some time.
Installing KB5124010 is relatively straightforward: simply open Settings, click on “Windows Update,” and then select “Check for Updates.” Note that this is an optional update, so you’ll need to click the “Download and install” link unless you have the “Get the latest updates as soon as they’re available” option enabled. You can also manually download and install the preview update from the Microsoft Update Catalog.
It’s worth noting that once installed, KB5124010 will upgrade Windows 11 devices to builds 26200.9550 (for 25H2) or 26100.9550 (for 24H2). Additionally, this update comes with several other changes and fixes, including the ability to use slideshow wallpapers with multiple desktops and new gesture controls for precision touchpads.
In related news, Microsoft is reminding users that KB5124010 marks the final preview update for Windows 11 24H2, which will reach end of support in October 2026. As such, it’s essential for users to migrate to a newer version of Windows before this date to ensure continued security and feature updates.
In summary, KB5124010 is an optional non-security update that brings numerous improvements and fixes to the table – from Bluetooth enhancements to accessibility features. If you’re running Windows 11 24H2 or 25H2, it’s worth considering installing this preview update to experience these changes firsthand.
Source: Bleeping Computer — 2026-09-24