No. My 3DS has the latest firmware and my game has the latest update so it's impossible. Besides, I restarted my New Leaf town on the 21st of September 2016 and I still think it's a bit too early to hack it. As for my second GameCube town, that is hacked as I used to have a lot of fences around the place and it has a Nook's Cranny next to the sea along with a bridge that you can walk on and fall off into the ocean to get to the island without a GBA. I also hacked my villagers but I accidentally put more than 2 normal villagers.