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If your 3DS breaks and you buy a replacement, you will need to perform a System Transfer to move your Nintendo Network ID (NNID) and digital purchases. If the broken console cannot power on, Nintendo Support can manually unlink your NNID and move it to the new console. To do this, to verify ownership. Frequently Asked Questions (FAQ) Nintendo 3ds Serial Number Lookup
The standard "New 3DS" (the smaller, cover-plate version) hid the serial number in a tricky spot. You must: This public link is valid for 7 days
Ultimate Nintendo 3DS Serial Number Lookup Guide: Identify Your Model, Region, and Authenticity Can’t copy the link right now