Note: Doing this will prevent the eShop from working. In the absolute worst case this can brick your Wii U. If you don't do this, you allow Nintendo to update your console without asking. Settings > System Settings > Internet > Connect to the Internet > Select your connection > Change settings > DNS (Don't auto-obtain) Set your console's DNS to 168.235.092.108 (US) and 081.004.127.020 (EU) (use both) to block the console from downloading updates.
