Your printer.cfg file is in /user/printer_<model>.cfg.
language This is the language of the printer. Chinese/English.
boot This is a setup check to see if you have done initial setup of the printer. If you have not, it will ask you to do so.
wifi This is if you want wifi enabled or not.
area Your area code. Europe/China etc.
run_mode Not sure yet.
sound If you want touch beeps enabled or not.