I reinstalled windows 10 home from a USB stick (English version) and the licence still works. So all good there. If you do windows recovery tablet lets you choose between Chinese or English language.
If you wish to do a clean install of windows:
- BACKUP all drivers before you do anything (use double driver software)
- Make sure you DON’T delete the backup partition when installing windows so you can recover your tablet if you need to.
You do not need to make a fresh install, but I got mine from Bangood… and they tend to install their own spamware/software/account so I did a clean install.