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So I was running out of space on my 2GB SD card so I moved my files over to a 4GB SD card, but nothing from my SD card is appearing on my 3DS!! Can anyone help me???
First off, did you tried transferring everything from SD Card A to B? If not, then it could be that reason.
Second, have you tried putting the same SD Card B again? The 3DS can sometimes trick you.
Third, is SD card B is formatted on FAT32? If it is, but still doesn't work, you can try formatting that SD card again.
I dunno what you all did, when I put my data onto my new SD card everything transferred perfectly. My digital copies of games, their save data, my swapnotes, miis, everything.
When I transferred my old stuff to my new SD card, I did it all from my computer. Like I had my files from my old card copied to my desktop temporarily, then put the new SD card in and copied them from my desktop to the new card. It's really simple and it seemed to work for me, try doing that.