You can downgrade at this time, you can only upgrade
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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.
Remove the battery for about 10 seconds. Then put it back in, and your DS/DSLite/DSi has been reset.
1. Click "I forgot"
No
A serial code for a dsi is on the back of the dsi under the barcode, only you start with tw not whatever is on there like this:TW582054296 Not a real code