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Fix: ‘Some update files aren’t signed correctly’ issue in Windows 11/10

Learn how to fix the "Some update files aren't signed correctly" error in Windows 11/10.

A huge number of computers around the world run on Microsoft’s Windows operating system. In this article we will show you how to Fix ‘Some update files aren’t signed correctly’ issue in Windows 11/10. These updates are very important for the system to work properly because they make it more useful, safer, and fix bugs and other problems that have been found since the last update.

But Windows updates might fail sometimes for a number of reasons. One of these is getting the message “Some update files aren’t signed correctly.” Error codes like 0x800b0109 and 0x800b0100 often go along with this problem and show that there are problems with the update process.

Windows updates include digitally signed files to make sure they are real and haven’t been tampered with, which is why errors about improperly signed files happen so often. The digital signature is like a security seal; it proves that the file is safe and came from the source that was given, in this case Microsoft. If the operating system can’t check this digital signature, it thinks the update file might be dangerous, which causes the error we just talked about.

What is The 0x800B0109 Error in Windows?

The 0x800B0109 error is something that many Windows users experience when they try to update their system. This error usually happens when there is a problem with the security certificate that checks that Windows updates are real and complete. The update process is messed up when the certificate is invalid or not trusted, which causes the 0x800B0109 error. On the other hand, this Windows update error could be caused by something other than the security certificate. It depends on how healthy your system is whether you get this error or not. Visit Windows official website for more details.

Causes of Windows 11 Update Error 0x800b0109

  • Interference from third-party software: Antivirus software or firewall software may stop or mess up the update process, which makes it impossible to check digital signatures correctly.
  • Issues with the Windows Update service: If there are issues with the Windows Update service, they can cause errors during the update process, such as when checking digital signatures.
  • Setting the date and time: If you don’t set the date and time correctly on your computer, the Windows update process might not work right. It is very important that the date and time on your system are correct.
  • Parts of Windows Update that are broken: Over time, the Windows Update service’s parts may become broken or misconfigured, which can cause problems during the update process.

Fix: ‘Some update files aren’t signed correctly’ issue in Windows 11/10

Check the Windows Update and BITS Services Are Enabled

  1. Press the Windows logo and the S key on your keyboard at the same time.
  2. Type services” into the search bar to find the app whose title matches.
  3. When you get to the search results, click on Services.
  4. To get to the settings for Windows Update, double-click on it.
  5. Change the setting for Startup type to “Automatic.”
  6. To run the Windows Update service, go to the properties window and click Start.
  7. Press the Apply and OK buttons to save the changes.
  8. If you double-click the Background Intelligent Transfer Service, you can see how it is set up.
  9. Choose the option for “Manual startup.”
  10. If the BITS service is not running, click the Start button.
  11. Then click “Apply” and “OK” to set the settings for that service.

Try Downloading the Failed Update From Microsoft Update Cataloge

  1. To get to Settings, press the Windows logo and the “I” key at the same time on your keyboard.
  2. Go to Settings and click on Windows Update (or Update & Security).
  3. Click on Update history to see which updates were installed and which ones didn’t work.
  4. Writing down the KB code for the Windows update that failed is important.

Allow Signed Update using Registry

  1. Open the Registry editor using either the Run command or by searching in the Start menu.
  2. Head to the below path on the Registry Editor:HKEY_LOCAL_MACHINE \ Software \ Policies \ Microsoft \ Windows \ Windows Update
  3. On the Windows Update folder, you need to right-click and click on New >> DWORD (32-bit) value. Name this newly created key “AcceptTrustedPublisherCert”.
  4. Select AcceptTrustedPublisherCert and click on it twice.
  5. Now, make sure that the value is set to 1 and the Base is set to Hexadecimal.
  6. Close the Registry Editor and start up your computer again.
  7. Check to see if the problem goes away by running the Windows Update app.

Run the Windows Update Troubleshooter

  1. To get to the Settings app, press Win + I.
  2. Then click on “Update & Security.”
  3. Open the left pane and click on “Troubleshoot.”
  4. Scroll down until you see “Windows Update” on the list of ways to fix problems. Press the “Run the troubleshooter” button after clicking on it.
  5. To find out what’s wrong with Windows Update and try to fix it automatically, follow the steps shown on the screen.
  6. Turn your computer off and on again to see if the problem goes away.


How do I fix Windows Update error in Windows 11?

The Update Troubleshooter can help you fix the issue if you get an error code while downloading and installing Windows updates. Go to Start, then Settings, then System, then Troubleshoot, and finally Other Troubleshooters.

Why is Windows 11 Update not installing?

Installing and downloading Windows 11 Cumulative Update might not have worked if your system partition does not have enough free space. The issue is also caused by things like broken update components, damaged system files, antivirus software interfering, and services being turned off.

Is Windows 11 worth it?

Is Windows 11 Worth It? Windows 11 is definitely worth the upgrade to improve the performance of your device, unlock the latest features, including widgets and Android apps, and create a personalized user interface.

Michael Smith
Michael Smith
Michael Smith, a tech-savvy content editor at Bollyinside. With a knack for simplifying complex tech concepts, Michael specializes in crafting user-friendly "How-to" articles and valuable tips. His focus spans Windows, Mac, hardware, and support. Beyond work, he's an avid explorer of diverse tech fields, constantly staying ahead of the curve.


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