Win10 upgrade 9879 failed error code solving tutorial

First of all, it is recommended that the user restore the registry key value that has been changed, then restart the computer, and then try to upgrade again when the network is relatively stable. This method is invalid. You can refer to the following methods.

Method 1: Rename the SoftwareDistribution folder
· Disable the Windows Update service in the service
· Open the C:Windows folder and right click on the SoftwareDistribution folder to rename it.
· Re-enable the Windows Update service after the rename is complete.

Method 2: Repair Windows components
Simultaneously press Win + X, select command prompt (admin), and then enter the following command (you can also copy and paste right):
Dism /Online /Cleanup-Image /CheckHealth
Dism /Online /Cleanup-Image /RestoreHealth

Method 3: Use the ISO image to upgrade directly to Win10 Preview Build 9879