Gamecube and Wii corruption are very similar due to the fact the Wii is essentially an upgraded Gamecube at its core.
At the moment, the best way to corrupt Gamecube/Wii is with RTC, through Dolphin-Vanguard.
Recommended setup: Vector Engine Startup vector suggestions: Limiter: One, Value: Two Limiter: Extended, Value: Extended Limiter: Giga, Value: NOP
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