: If using an external drive, plug it into the Wii U and format it via System Settings > Data Management . Prepare the SD Card : Create a folder named install on the root of your SD card.
Place the game files (usually .app , .h3 , .tik , .tmd files) inside a subfolder within install (e.g., SD:/install/New Super Luigi U/ ). : New Super Luigi U WII U ISO (Loadiine & USB) (USA)
Insert the SD card into your Wii U and launch via the Homebrew Launcher or your Home Menu channel. : If using an external drive, plug it
Select the game folder, press , and choose USB as the destination. Method 2: Loadiine GX2 (SD Card Only) : Insert the SD card into your Wii
This runs decrypted games directly from the SD card. It is often slower than USB but useful for quick testing. How to Format an External Storage Device - Nintendo Support