Step 3. Copy the data to your new SD card.Step 4. Insert the new SD card with all of your copied data back into the 3DS's card slot. Turn on the power, and everything should be working like nothing ever happened. Extra Tips to Fix Could Not Detect an SD Card (Error Code: 007...
place a small amount of rubbing alcohol on a cotton swab. Rub this onto the pins of one of your games. Then, with the console off, insert and remove the cartridge around ten times. This should hopefully clean the pins
Cleaning the cartridge slot Cleaning the contacts on dirty cartridges with isopropyl alcohol and some Q-tips is easy, but if you do that and you find that you’re still having trouble getting games to work, you may need to clean the contacts in the Game Boy’s cartridge slot. ...