3DS to New 3DS or 3DS XL System Transfer - Nintendo 3DS Guide - IGN
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3DS XL won't read these SD cards (trying to install homebrew). Tried using SD Card Formatter multiple times and it still won't work instead this prompt pops up(both cards are detected by
Nintendo Support: How to Insert an SD Card or microSD Card
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How to utilize the 3DS MICROSD MANAGEMENT to transfer files wirelessly - YouTube