I have two 3DS cnsoles, one 4.x and one 9.x. My Gateway works fine in the 4.x console. Now that we can use it on 9.x consoles, I have discovered that in my 9.x console, the Gateway normally won't work unless I push it into the slot slightly (not even enough to unlock or lock it, just a very slight amount). I was wondering if anyone else has had this happen to him and, if so, how I can file down the cartridge to make it make easier contact. I guessed that filing the bottom of the cart *might* do it, but the lock mechanism obviously uses the notch on the side. and I'm afraid that filing the bottom might not only not do it, but also break something.