Nintendo officially only supports memory cards up to 32GB -- no matter whether you're using SD or microSD cards and which 3DS iteration you own.

Apple's Wallet app in iOS 26 includes a new feature that lets you store physical card information alongside your digital payment cards. This ...

For more, see: Moving 3DS SD Card Data. The New Nintendo 3DS is officially compatible with anything from a 2GB microSD card up to a 32GB microSDHC card, though larger cards can work as well with ...