Windows 11 KB5124010: Should You Install It ?

Windows 11 KB5124010 is an optional, non-security Preview update for Windows 11 24H2 and 25H2. It brings several useful changes to File Explorer, Bluetooth, Precision Touchpads, accessibility, Emoji 17.0, and the Copilot key.
However, Microsoft also lists known issues involving Credential Guard and USB Audio Class 1.0 devices. There are also user reports of some games crashing after the update, although Microsoft has not confirmed that KB5124010 is the cause.
For a PC that is already stable, there is generally little reason to rush into an optional Preview update unless you specifically need one of its fixes or features.

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What Is Windows 11 KB5124010?​

KB5124010 is the September 2026 non-security Preview cumulative update for Windows 11 24H2 and 25H2.
After installation, the builds become:

• Windows 11 25H2: 26200.9550
• Windows 11 24H2: 26100.9550

Because this is a Preview update, it is optional rather than the regular monthly security release. Microsoft describes it as a quality update containing new features, improvements, and bug fixes.

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What's New in KB5124010?​

🗂️ File Explorer improvements
KB5124010 improves several parts of File Explorer, including:

• Better handling of previews for downloaded files.
• A new Preview anyway option for HTML files after a security warning.
• Automatic previews for supported non-HTML files such as PDFs.
• File Explorer Home now remembers whether sections were expanded or collapsed.
• More reliable thumbnail previews for cloud files.
• Improvements to the Details pane and address bar behavior.

🎨 Emoji 17.0​

The update adds support for Emoji 17.0, including new emoji and updated designs for several existing ones.
You can open the Windows emoji panel with:

Windows + .

🖱️ Precision Touchpad improvements​

Windows 11 adds more gesture options for supported Precision Touchpads, including:

• Single-finger scrolling from the left or right side.
• Automatic scrolling when moving your finger toward the edge of the touchpad.

These options are available under Settings > Bluetooth & devices > Touchpad.

⌨️ Copilot key can be remapped​

KB5124010 adds an option to change what the dedicated Copilot key does.
Depending on your setup, it can be remapped to act as:

• Right Ctrl
• Context Menu

This can be useful if you prefer traditional keyboard shortcuts instead of opening Copilot.

📷 Camera and backup improvements​

The update also introduces Camera Roll backup for eligible devices through OneDrive and fixes an issue where the built-in camera could stop working in some applications.

💾 File History fix​

One important fix addresses a problem with File History.
Before the fix, some systems could fail to back up or restore files to an external drive or network location and might incorrectly display a message asking users to reconnect the drive.
KB5124010 addresses this issue.

🛠️ Sysmon improvements​

The update also fixes several System Monitor (Sysmon) issues related to executable validation, file-system monitoring, and incorrect process tampering alerts.

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Known Issues in Windows 11 KB5124010​

⚠️ There are two important issues that Microsoft officially lists for this update.

1. Credential Guard and Active Directory trust problems​

Some domain-joined devices using Credential Guard may lose their secure trust relationship with an on-premises Active Directory domain.
Affected users may be unable to sign in with valid domain credentials and could see a message saying that the trust relationship between the device and the domain failed.
Microsoft says the issue is related to Machine Identity Isolation settings and is particularly relevant to environments that do not meet the required Windows Server 2025 Domain Functional Level conditions.
This is mainly a concern for managed business and enterprise environments rather than typical home PCs.

2. USB Audio Class 1.0 problems​

Some USB Audio Class 1.0 devices can experience:

• Code 10 in Device Manager.
• No audio output.
• Unresponsive volume controls.
• Problems with Windows sound settings.

Microsoft has been working on a resolution. An out-of-band update released on September 14, 2026 partially addressed the USB audio issue, particularly problems involving 8-channel and 3D audio modes, but Microsoft continued to track other symptoms.
So if you use an older or specialized USB Audio Class 1.0 device, check your installed updates before assuming KB5124010 is the only relevant update.

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Are Games Crashing After KB5124010? 🎮​

There are reports from users that some games began crashing or failing to launch after installing KB5124010.
Reports have mentioned titles such as:

• Battlefield 6
• Battlefield 2042
• WARDOGS
• Other games using anti-cheat systems

Some Battlefield players reported crashes shortly after launching the game, while WARDOGS users reported launch failures and errors such as WD-L020. Some affected users also reported that removing KB5124010 restored normal game behavior.
However, there is an important distinction:
Microsoft has not officially confirmed that KB5124010 is the cause of these gaming problems.
The reports are currently user-reported compatibility issues, so it is better to describe the connection as a possible problem rather than a confirmed KB5124010 bug.

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Should You Install KB5124010?​

The answer depends on how you use your PC.

Situation	What to consider
Normal home PC and everything works	Waiting for the next regular update is reasonable
You need a specific fix from KB5124010	Installing it may make sense
You use USB Audio Class 1.0 hardware	Check compatibility before installing
Your PC uses Active Directory + Credential Guard	Test carefully before deployment
You play games with anti-cheat	Consider waiting until compatibility is clearer
You like testing new Windows features	You can install the Preview update and monitor for problems

For most users with a stable Windows installation, KB5124010 is not an update you need to install immediately. It is optional and does not provide the normal monthly security fixes.
If you do not need a particular feature or fix, waiting for the next regular cumulative update can reduce the risk of encountering Preview-update compatibility problems.

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What If You Already Installed KB5124010?​

Don't panic. If your system is working normally, there is no need to remove the update just because other users have reported problems.
Instead, check whether you experience symptoms such as:

• Games crashing immediately after launch.
• USB audio devices showing Code 10.
• Audio disappearing.
• Domain authentication or trust problems.
• Backup problems.

If a specific problem started immediately after installing the update, check Windows Update history and consider uninstalling the Preview update after confirming that KB5124010 is the likely change responsible.
You can find the update history under:
Settings > Windows Update > Update history
Then look for the option to uninstall updates.

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Bottom Line​

🟢 KB5124010 is useful if you want its new File Explorer, Touchpad, Emoji, Copilot key, backup, or other fixes.
🟡 It is optional, so you do not have to install it immediately on a stable PC.
🔴 Be more careful if you use Credential Guard with Active Directory, USB Audio Class 1.0 hardware, or games affected by the reported compatibility problems.
The safest practical approach for a stable everyday PC is to wait for the next regular Windows update unless KB5124010 contains a fix or feature you specifically need. Microsoft continues to track the documented issues, while the reported gaming problems remain unconfirmed.

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Frequently Asked Questions​

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Is KB5124010 a security update?​

No. KB5124010 is an optional non-security Preview update for Windows 11 24H2 and 25H2.

What build does KB5124010 install?​

It updates Windows 11 25H2 to Build 26200.9550 and Windows 11 24H2 to Build 26100.9550.

Should I install KB5124010 if my PC is working fine?​

You do not need to install it immediately. Since it is an optional Preview update, waiting for a later regular cumulative update is a reasonable choice if you do not need its specific fixes or features.

Can KB5124010 cause game crashes?​

Some users have reported crashes or launch failures in games such as Battlefield 6 and WARDOGS after installing KB5124010. Microsoft has not confirmed the update as the cause, so these reports should be treated as possible compatibility issues rather than an officially confirmed bug.

Does KB5124010 fix File History?​

Yes. Microsoft says the update addresses an issue that could prevent File History from backing up or restoring files to external drives or network locations.

Can I uninstall KB5124010?​

If the update is installed and causes a problem, you can check Windows Update > Update history and use the available uninstall option. Before removing any Windows update, make sure you understand which update you are removing and restart the PC afterward if Windows requests it.