Just got this today and it won't read the SD cards. : r/3DS
EEEkit 28-in-1 Storage Case Holder For Game Memory Card /Micro SD For 3DS / 3DS / DSi / DSi XL / DSi LL / DS / DS Lite, Game Card Storage Protector Box - Walmart.com
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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
Unbranded 4GB SD Card Memory / Cameras Wii 3DS Ds Computers & More micro & adptr | eBay
How to transfer 3DS SD card data and use high capacity (bigger than 32GB) microSD cards on the New Nintendo 3DS XL