From what I understand it will work on every firmware out now up to 5.5.1 and it is best to have it on he latest to avoid issues. I have questions I would like answered. 1.Is the exploit in the sd card itself. Meaning I can run it and when it is out of the Wii U I can play normal wii u game discs online if I can? 2.Does the speed of the sd card buy actually matter or is limited by what the wii u can actually read? 3. When playing wii game backups are they also limited to the sd card speed and experience slow downs? 4.When playing wii back ups and n64 games can u use the wii u pro controller? Or what controller can you use?