Pre-installed Win7 upgrade Win10, fallback system re-install Win10 can not be activated solution

Recently, some users will upgrade their Win7 pre-installed Win7, back to the previous Win7 system, want to re-install Win10 system, It is true that the Win10 system is not activated. Clicking Activate will prompt the activation to fail. How to do? To solve such a problem, look for the reasons and solutions from below!

concrete steps:

First, the failure phenomenon:

The factory-installed Win7, Win8, Win8.1 machine upgrade to genuine free upgrade during Win10 Win10, then roll back or restore the factory system, now has a free upgrade period, can not be activated after reinstalling Win10 with the image.

Second, the reason analysis:

The Win10 installation image is preset with KEY, and the official version of Win10 obtained through the upgrade method is activated by digital license, so Windows cannot be activated normally.

Third, the solution:

1, you can download the original Microsoft version of the system image without KEY reinstall Win10, after the installation is complete, enter the system online activation.

2, how to determine the use of the image has a problem:

3, in the process of installing Win10, if there is a step to enter the KEY, then the mirror does not have a KEY, skip this time In this step, after the installation is completed, log in to the Microsoft account that was originally activated by Win10, and the network can be activated.

4, if the installation process does not need to enter the KEY, then the mirror comes with KEY, Win10 will not be activated after using this image installation

5, if you have used the mirror with KEY Installed Win10, do not want to re-install, it is recommended that you contact Microsoft to handle.

It is not a big problem to encounter such a situation. Need specific analysis of specific problems, first find out the cause of the failure, and then solve it in the cause of the failure.