You’ve probably already downloaded the USB Helper gamecube injection program if you’re interested hacking your Wii U. It doesn’t work the first time you launch it. The tool creates a virtual card and crashes. It’s better to try a new application instead of relying on the original one. To install USB Helper, you need to install WUP Installer GX2 instead.
This tool allows you to back up your Wii games and download DLC or updates. It also works with other software, such as the Cemu emulator. This software is free, and works with a variety of emulators, including the original Nintendo GameCube. Alternatively, you can also download emulators that work on the Wii U. If you’re a Wii U fan, you can use the USB Helper for that.