One day, if you have to idea to downgrade Wii U menus (like: Wii U Menu, HOME Menu, etc...). Don't do that if you don't have any knowledges. I found myself with my Wii U bricked for a week beacause of a simple file... Don't forget this: the Wii U is so securised, [...]
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(suite of my sentence) modify a small file can be dangerous. I'll give you this advises beacause doing that things can brick your Wii U for life.