I'm 100% certain my Wii U is on 5.5.1. I attached a picture of my Wii U's system version in order to relieve any doubts. (Crappy quality because the system version is only displayed on the Gamepad.) So with that being said, I blocked Nintendo's update servers to protect my Wii U from any future updates. I have haxchi, but I don't want updates being installed without me knowing about it. In my Download Management, it shows that there's a system update that tried to download. (Also attached a pic for that.) Are there any disadvantages to installing it? Thanks in advance.