What should I do if I get error 720 after upgrading win8.1?

After updating from win8 to 8.1, I found that the vpn login appeared 720. I saw a variety of unclear methods on the Internet. Here I introduce a simpler method that Xiaobai can understand

1, first right click on this computer to open the device manager, then we found that the network adapter, wan mini port (ip /ipv6 /network monitor) appeared a yellow exclamation point, it seems that the problem is here.

2, right-click update is not used to click to uninstall and can not uninstall online There are many ways to delete after modifying the registry, but for Xiaobai, the registry is a nightmare, so we follow the following method < Br>

3, right wan mini port (ip) - update driver software - browse the computer to find the driver

4, select from the computer's device driver list - cancel display compatible hardware - and then Pull down to find the Universal Mobile Broadband Adapter - then the next step is to install

5, after the installation is complete, you will be prompted with error number 10. Don't worry about it, go back to Device Manager and uninstall the newly updated Mobile Broadband Adapter

6, then restart the computer this step is very important. This time restarting the computer may be a bit slow, because the computer is reinstalling the adapter that was just deleted, after the restart is completed, open the device manager and find that the exclamation mark has disappeared. Now let's try again with vpn.

Note: There may be a short network disconnect when updating the driver. If it fails, please bring all the yellow exclamation mark The adapter is fixed in the same way.