On a modified Wii U console, WUP files are the "gold standard" for playing backups because they install the game directly to your system menu (NAND) or an external USB drive.
Getting these files to "work" depends entirely on whether you are using an original console or a PC emulator like Cemu . How WUP Roms Work on Real Hardware wii u wup roms work
In the world of Wii U modding, "WUP" files (referring to Nintendo's official product code) are the gold standard for installing content directly to your home menu. Unlike standard ROMs used in emulators, WUP files are essentially the raw data "packages" the Wii U uses to install games, updates, and DLC. The Core Concept On a modified Wii U console, WUP files
: The "ticket" file containing the title key needed to decrypt the game content. Unlike standard ROMs used in emulators, WUP files