A malicious actor repacks a game to overwrite a critical System Menu IOS (like IOS 30 or 80) with a "stub" (empty firmware). This instantly bricks the Wii. Never install a WAD that claims to be "IOS80-Repack." Stick to game channels only.
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WAD repacking can be used to force a game from one region (NTSC-U) to run on a console from another region (PAL) by patching the video mode settings within the WAD's internal configuration. A malicious actor repacks a game to overwrite