Not sure if this will work on your tablet. But I did it on the V820W CH running Win10. When you go to control panel and go to “Add a language” settings. Now you must already have the English installed and set as Enabled. On the left side, click on “Change date, time, or number formats”. Go to the “Administrative” tab. Under “Welcome screen and new user accounts” click on the button that says “Copy Settings”.
The Current User should all say English, but the Welcome Screen and New user accounts will probably say Chinese. At the very bottom there are 2 checkboxes. Check those boxes for copying current settings to Welcome screen and system accounts and to New user accounts. Now click OK and it will tell you you need to reboot. After rebooting it should be mostly in English. I have not fully gone through if everything is English or not, but it worked on some things.
