Wii U Wup Roms | Work
The app reads the .tmd and .tik files to understand how to unpack and "install" the .app data directly onto the Wii U’s internal storage (NAND) or an external USB hard drive.
: The most common method to install these is using WUP Installer GX2 . You place the WUP folder inside an install folder on your SD card, then use the homebrew app to install it to your System NAND or USB. wii u wup roms work