What data will be erased?
• Data saved on the system memory, such as software
downloaded from Nintendo DSi Shop.
• Changes made to the System Settings
Users Manual: Format System Memory: Delete all added software and save data. (See page 85)
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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.
New firmwares permanently overwrite each other, so even a factory reset doesn't remove them, there's no real need to though.
1. Click "I forgot"
In America: A Nintendo DSi is $140; a DSi XL is $160. In Japan: A Nintendo DSi is ¥15,000; a DSi LL is ¥18,000. In the UK: A Nintendo DSi is £150. In Australia: A Nintendo DSi is $300.
Remove the battery for about 10 seconds. Then put it back in, and your DS/DSLite/DSi has been reset.