My son's second-hand 3DS XL has now turned up (bought from CEX). On opening it, I have to enter certain things - name, date of birth, country, wireless setttings, etc. I've got so far as the wireless settings bit, and it gives me an option to select it, and then to enter the wireless settings code. However, on selecting it, there is already an 8-digit wireless settings code entered (presumably from the last owner). How do I delete their code so that I can enter my wireless settings code? Also, the DS has come pre-installed with a game - if anything needs resetting to do this, will I lose the pre-installed game? Thank you.