Unfortunatly, my old DS-lite fell on the floor and broke. But luckily I have a 3DS, but when I wanted to download the event Mewtwo on my 3DS, it said that it was unable to connect with my wifi because the system and the save data weren't compatible. Then it asked if I wanted to upload the save data to this system but it said that when I do this, I would lose my earlier save data. If I do this, will I lose my whole game, or only some wifi save data?