Short Version: Trying to do a new Ninjhax 1 install on an old 3DS, I run it, it gets to 40% and then it loads the internet browser and freezes.
OK I'm on an old 3DS. I updated it to 8.1.0-10U using the game LEGO Ninjago Shadow of Ronin. I use Cubic Ninja to install Ninjahx 1...