Okay, so let's say you're trying to transfer your data to a larger SD card.
When you do the transfer the right way, your games, DLC and extra data are all deleted.
Instead, you have games and DLC and stuff that you deleted a long time ago.
Obviously, you want to solve this problem to have the correct data.
Here's how to solve:
I encountered this problem recently.
What I did was open the folder entitled "Nintendo 3DS"
I had three folders inside that one. Two were random numbers and letters, other was titled private.
The "private" folder (Inside Nintendo 3DS folder) has stuff for 3DS sound and ****
One gibberish folder had some **** that didn't matter
I opened the other gibberish folder. This folder had two folders. These two folders contained ALL of the info for games, DLC, data, save-backups and whatnot
i noticed that both had similar content
Upon deleting one, my problem was solved. My old stuff (which had returned upon transfer without explanation) was gone
The stuff that I wanted and should be there were back and ready to roll
I know that this is a specific and weird problem, but I had been trying to deal with it for over a year.
If anyone else encounters this problem at some point, I hope that this post would be able to have been of help
all you have to do is explore your files and attempt at deleting some