Here's how to use a save file once you have CFW:
(like Checkpoint or JK’s Save Manager), it effectively gives you “100+ save files” for any game—physical or digital. Use it. 3ds 100 save files new
An SD card (or MicroSD with an adapter) matching your system. Here's how to use a save file once
You can use this to export save files from a cartridge and inject them back onto your system. You can use this to export save files
Because 3DS save data is locked to the hardware console that created it, you cannot simply drag and drop files into a folder like you would on a PC. Accessing these saves requires and a dedicated save manager . The most popular and trusted tool for this is Checkpoint (often listed as "Checkpoint, a simple and fast save manager" on GBAtemp).
A save manager is the homebrew application used to backup, restore, and manage save files. Two are the most common:
Your 3DS must be modded with Luma3DS and Boot9strap.