1. Click "I forgot"
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First you go to settings and then on the 3rd page it says parental controls and tap that and then it says parental controls yes or no, and simply tap no
Find the part that shows a picture of the Nintendo DSi Settings> Parental Controls and select forgot password, forgot secret question, now type the enquiry number.
No but you can use parental controls
They just have to go to Parental Controls, and keep selecting I Forgot until it gives you an Inquiry Number. You then go to the website and type in your inquiry number where is asks for a confirmation number (they are the same thing) and select the correct date from the drop-down menu. It will give you a master key code that you can use for unlocking Parental Controls. This website also works for the DSi. NOTE: With the DSi, it can be very hit-and-miss, since there are reports of it working, and reports of it failing.
A Nintendo DSi can be reset in a few ways. One way it to remove the battery from the back, another way is to go into the 'settings' and restore the factory settings.