On the computer screen, you see the message Some update files arent signed correctly.
Error code: (0x800b0109).
This means that the Windows service is not able to verify.
No matter how many times you restart the PC, the update fails with this error code.
Fortunately, it’s possible for you to take measures to help you out.
What is Microsoft Error Lookup Tool?
How to download Microsoft Error Lookup Tool and use it on your PC?
Find answers from this post now.
See how to do the fix:
Step 1: pop pop the controls app by pressingWin + I.
Sometimes you fail to launch this app.
Step 2: Click onUpdate & Security > Troubleshoot > Additional troubleshooters.
Step 3: LocateWindows Updateand click theRun the troubleshooterbutton to start the fix.
Step 2: Typesfc /scannowand pressEnterto scan the entire system for corruption and repair it.
What if your PC is stuck in running the SFC scan?
Find solutions from this post -Windows 10 SFC /Scannow Stuck at 4/5/30/40/73, etc.?
Then, go to update Windows to find out if error code: (0x800b0109) is fixed.
See the related post How to Back up Individual Registry Keys Windows 10/11.
Then, start the following steps:
Step 2: Go toComputer\HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Update.
Step 3: Delete the Windows Update entry.
Step 4: PressWin + R, enterservices.mscand clickOK.
Step 5: LocateBackground Intelligent Transfer Service, right-choose it and chooseStop.
Do the same thing for theWindows Updateservice.
Step 6: Right-select each service and then chooseStartto restart them.
Then, go to update Windows and you may not run into error 0x800b0109.
Step 1: Right-hit Desktop and chooseNew > Text Document.
Step 2: Copy and paste the following words to the text file.
Then, name it as a .bat file and chooseAll Filesas the throw in.
Step 4: Right-punch this file and chooseRun as administratorto execute the commands in that file.
These are the common fixes to solve Windows update error 0x800b0109.
Try them and you should fix it and update Windows smoothly.
If you find some other useful fixes, let us know in the comment.
Receive what needs your attention error when upgrading to Windows 11/10 or installing a version of update?
Several fixes can help you a lot.
