How to troubleshoot Some update files aren’t signed correctly on Windows 10

At the time of downloading an update from the Microsoft server, your system checks the validity of the update. It is quite similar to how browsers check for a valid certificate. If you are receiving an error that says “Some update files aren’t signed correctly, error code 0x800b0109,” this means the Windows service is suspicious or has not been able to be verified. In this article, we are going to share some guidelines to help you troubleshoot this error.

Tips to fix Some update files aren’t signed correctly, Error code 0x800b0109

Tip 1: Restart and tap on Retry

  1. Save your data or any other work that you were doing on your PC.
  2. Restart your computer.
  3. Then tap on “Check for Updates” button again.
  4. This is a standard troubleshooting solution that has worked for many.

Tip 2: Try aging later

  1. The problem that is occurring could be a Microsoft server-side issue. That’s why we recommend to you wait for an hour or more.
  2. And then recheck for updates. This should resolve the error.

Tip 3: Delete the contents of the Temporary folder

In order to resolve this error, you try deleting all of the downloaded, failed and pending Windows 10 updates. To do so, follow these steps:

  1. Open the ‘Run’ dialog box by pressing Windows + R key simultaneously.
  2. Then in the dialog box that opens, you need to type “%temp%” and press Enter.
  3. Now, in the folder that opens before, you have to you select all the files and folders present the Temp folder and then delete them all.

Tip 4: Run Windows Update Troubleshooter

Also, you can try running the inbuilt Windows Update troubleshooter to troubleshoot many of the most common Update issues on Windows 10.

Tip 5: Clear the Software Distribution and Catroot2 Folder

When the updates are downloaded by Windows, updates are reserved in a dedicated folder called as Software Distribution. Whatever the files system downloads here, are automatically deleted once the installation is finished. So you may need to remove all the files kept in the Software Distribution folder after pausing Windows Update Service. Thus, resetting the catroot2 folder is believed to troubleshoot many Windows Update issues.

Tip 6: Restart in Clean Boot State and reinstall the Update

You can use this mode to diagnose and fix the advanced Windows problems. Restart your device in Clean Boot State, and then try to run the Windows Update. Now, see if this resolves the error. Note that you will need to use “msconfig” here. So, before beginning to execute this method, you need to make sure that you have the admin privileges to perform it.

Thank you for reading this post! We hope this information will help you troubleshoot “Some update files aren’t signed correctly, Error code 0x800b0109” issue on your Windows 10 PC.

John Wick  is a Microsoft Office expert and has been working in the technical industry since 2002. As a technical expert, John Wick has written technical blogs, manuals, white papers, and reviews for many websites such as

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