The Cemu emulator itself is legal, as it is a clean-room reimplementation of Wii U hardware. However, the system files required for the Wii U Menu, including the NAND dump, are copyrighted by Nintendo. It is . We strongly recommend dumping your own Wii U console for personal use. Downloading these files from unofficial sources resides in a legal gray area and is a choice you must make for yourself.
Why? Because the Wii U Menu offers:
: Re-dump the Mii database components using Dumpling and place them in the corresponding 00050010 subfolders. "Incompatible File Type" Error how to get wii u menu on cemu hot