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Wiimmfi is a replacement for Nintendo WFC. It allows you to play games and WiiWare online such as Mario Kart Wii and Super Smash Bros Brawl. You can enable wiimmfi for disc games in priiloader https://wii.guide/priiloader.html or use the game disc patcher. If you would like to use Wiimmfi in a game loader such as USB Loader GX or WiiFlow, you need to enable the Wiimmfi in the private server option in the game load settings. If you want to play WiiWare games online, you will need to use the WiiWare patcher https://wii.guide/wiiwarepatcher.html You can find more information here https://wii.guide/wiimmfi.html