You can update the Wii via the Nintendo updates, provided on the retail games. They do not conflict with any homebrew related installations, custom firmwares I would not know because they are used for PIRACY. You cannot patch a game you have purchased, unless you rely on a backup or piracy.
I cannot answer this question, because it conflicts with the rules of DCEmu (PIRACY).
Please purchase retailed games, you will find no problems.
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