There is no MIOS on the Wii-U to reinstall.
Well, even if that's the case, it's most likely caused by SOME sort of error in installation. That's why I wanted to try restoring my nand backup. Is there any way to do that on Wii U?The Wii U doesn't have MIOS installed so don't go installing it there and Nintendont doesn't rely on MIOS at all. Nintendont runs GameCube Games in Wii mode not GameCube mode. So DIOS MIOS cannot be the issue.