NNUPatcher isn't working for me too. I've already tried with Mario Maker, Mario Kart 8 and Super Smash Bros. But Mario Kart is the only one i manage to install updates using NNU patcher. Eshop works fine with it, but i can't update my games.
(And, sometimes is a pain to get the update and use the WUP to install it, i didn't have 100% success even with this method, at least i can install the games though)
(And, sometimes is a pain to get the update and use the WUP to install it, i didn't have 100% success even with this method, at least i can install the games though)