My Nintendo 3DS has more blocks than my friend's. We both have the same size SD card, 4 GB. For me there are approx. 29,000 free blocks and for my friend approx. 1,900.
Then he most likely downloaded games from the e-shop.
We already checked that, but he doesn't have any games from the e-shop.
Were there any games preinstalled on the 3DS?
No actually not
Pictures, videos etc?
I have now found out that there were old videos on the SD card when opened with the PC. But thanks anyway