Download and install Putty from the link below:
When you open it type the IP address of the unit into 'hostname' and hit return.
You will now be asked to log in. The login name is 'root' and the password is 'linux'.
Now all you have to do is copy and paste the below command and hit return:
Now change the folder and es systems files again.
Once that done put the below command into putty and hit return:
Go back to the unit itself and reboot then go into the UI settings and change the theme to Batocera Light.
Hopefully it works, if not I give up lol