A major new update has landed for Windows 11, bringing a slew of improvements and bug fixes to users. The KB5124010 September 2026 non-security preview update is now available for both Windows 11 24H2 and 25H2 devices, with 46 changes aimed at enhancing the overall user experience.
This optional update allows administrators and users to test new features, bug fixes, and improvements before they become generally available during next month’s Patch Tuesday release. Unlike regular cumulative updates, this preview update focuses on quality improvements rather than security patches. In other words, it doesn’t address any known vulnerabilities or security threats.
So what can you expect from the KB5124010 update? For starters, Microsoft has added support for Emoji 17.0, which brings new and updated emojis to Windows devices. The update also includes a new “Open apps maximized” accessibility setting that automatically maximizes app windows as they open. Additionally, users will now be able to remap the Copilot key on their Windows devices to function as the Right Ctrl or Context Menu key.
The update also resolves several issues that were causing problems for some users. For example, a bug that could cause crashes with error code 0x139 while streaming Bluetooth audio has been fixed. Furthermore, the Bluetooth radio control toggle in Settings will no longer show as “on” when the radio is actually turned off. These improvements should make a big difference to those who rely on their devices for work or play.
Microsoft has also made some changes behind the scenes. The update removes the PC-to-PC Migration tool, which was used to transfer files and settings between Windows devices. Instead, users are now recommended to use Windows Backup with OneDrive to migrate to a new PC. This change is likely aimed at simplifying the migration process and reducing potential issues.
As always, it’s worth noting that this update is optional, so you can choose whether or not to install it. To do so, simply open Settings, click on Windows Update, and then check for updates. If the KB5124010 update is available, you’ll see a “Download and install” link – just click on it to get started.
If you’re a Windows 11 user, this update is definitely worth considering. With its focus on quality improvements and bug fixes, it should make your device run more smoothly and efficiently. So go ahead and give it a try – but remember that this is a preview update, and some features may still be in development or testing.
Source: Bleeping Computer — 2026-09-24