This blocks updates from Disc, making games playable without removing homebrew.
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I wanted to install USBLGX to backup games (NO I WONT UPLOAD ANY OF THEM ANYWHERE), but also use RiiTag.
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However, when quitting, attempting to play Pac-Man Party, it asked for an update. This disc hadn't asked for it, so I shut off the Wii,
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and had the idea to disable it in PL, so I turned it back on, and held RESET. I went to "System Menu Hacks", and enabled "Block Disc Update Check" (i think this is what it's called???) and went back and it worked.