Did you dump the save file too?
Rename it "titleid.sav" where the titleid is dependent on your game. Search it up here (http://3ds.essh.co/)
Then drag the save file to your sd card (big one in the 3ds)
Supposedly works on 8.x. For more details, go ask smealum. *downs 2 shots*
OK so I put my mario kart in my 3ds I went to gateway settings and did save backup, I backed up the save on the big SD card. Then I renamed the AMKEY.SAV to 0004000000030800.sav, went into gateway mario kart and it says save is corrupted and will now delete it