The error message says “Some update files aren’t signed correctly. Error code: (0x800b0109)” which means you won’t be able to update your Windows because of this error. So without wasting any time let’s see how to actually Fix Some Update Files aren’t signed correctly issue while updating Windows with the help of below-listed troubleshooting guide.

Fix Some Update Files aren’t signed correctly

Make sure to create a restore point just in case something goes wrong.

Fix Some Update Files aren’t signed correctly Method 1: Run Windows Update Troubleshooter Method 2: Run SFC Method 3: Run DISM (Deployment Image Servicing and Management) Method 4: Registry Fix

Method 1: Run Windows Update Troubleshooter

  1. In control panel search Troubleshooting in the Search Bar on the top right side and click on Troubleshooting.

  2. Next, from the left window, pane select View all.

  3. Then from the Troubleshoot computer problems list select Windows Update.

  4. Follow on-screen instructions and let the Windows Update Troubleshoot run.

  5. Restart your PC and see if you can Fix Some Update Files aren’t signed correctly while updating Windows 10.

Method 2: Run SFC

  1. Open Command Prompt. The user can perform this step by searching for ‘cmd’ and then press Enter.

  2. Now type the following in the cmd and hit enter:

  3. Wait for the above process to finish and once done, restart your PC.

Method 3: Run DISM (Deployment Image Servicing and Management)

  1. Open Command Prompt. The user can perform this step by searching for ‘cmd’ and then press Enter.

  2. Type the following command in cmd and hit enter after each one:

  3. Let the DISM command run and wait for it to finish.

  4. If the above command doesn’t work, then try on the below: Note: Replace the C:\RepairSource\Windows with your repair source (Windows Installation or Recovery Disc).

  5. Reboot your PC to save changes and see if you’re able to Fix Some Update Files aren’t signed correctly while trying to update Windows 10, if not then continue to the next method.

Method 4: Registry Fix

Backup Registry before moving forward, just in case something goes wrong you could easily restore the registry.

  1. Press Windows Key + R then type regedit and hit Enter to open Registry Editor.

  2. Navigate to the following registry key: HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate

  3. Right-click on WindowsUpdate key and select Delete.

  4. Close Registry Editor and again press Windows Key + R then type services.msc and hit Enter.

  5. Find Windows Update and Background Intelligent Transfer Service in the list. Then right-click on each of them and select Restart.

  6. This would restart Windows Update and Background Intelligent Transfer Service.

  7. Again try to update your Windows, if it still fails, then reboot your PC and update Windows. Recommended:

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That’s it you have successfully Fix Some Update Files aren’t signed correctly while updating Windows 10 to latest build but if you still have any questions regarding this post feel free to ask them in the comment’s section.

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