https://www.youtube.com/watch?v=7Mjo64Abqbs&t=2s USB: Format a USB drive as FAT32 or MS-DOS (FAT), empty the Wii drive, and install Homebrew. Create a Wii flash drive. Download IOS236, cIOSX Rev20b, and USB Loader GX channel. Do not turn the Wii off while installing. Plug the USB in and run USB Loader GX. Insert a game to burn onto the USB, and then select "Install".
https://www.youtube.com/watch?v=7Mjo64Abqbs&t=2s SD card: To mod a Wii with an SD card, follow these steps: Find your Wii’s MAC address. Format your SD card to FAT32. Download a modpack. Insert the SD card into your Wii. Make a backup in case something goes wrong. Launch the Wii Mod Batch from the Homebrew channel1. Alternatively, you can softmod any Wii by installing Bootmii and the Homebrew Channel, formatting the SD card, and downloading modpack files2.