I just got a brand spanking new Wii U Mario Kart 8 Deluxe 8 eBay this week, I updated to 4.1.0 from the game disc. But I cannot created a NNID. I ended up with 5.5.0 so I can have my ID created. I also bought the MK8 DLC. :) . Now, can I still install homebrew channel with the new 5.5.0 FW?