It's a bit complicated... You need to find the key to download Petit Modem on SmileBASIC, and download Petit Modem on your PC, and then, the best, most stable way to transfer files is to get a 'headphone splitter' for your 3DS/2DS, which has to be ordered online (but I plan on custom making one). Then, connect this adapter to your 3DS/2DS, and you have two connectors: Headphone connector, and...