>>57915336
the 3ds carts don't keep the save data what actually happened was that the carts were failing because the shitty boards they used for the carts towards the latter half of the 3ds life cycle essentially turned them in to self wiping ticking time bombs if you went long time (about 4 years iirc) without playing it at least once a lot of carts being sold on ebay are also most likely one of those timebomb carts and people are unaware of it