From Rare Gaming Dump
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MIOS is a version of the Wii's IOS system that allows the Wii to boot into GameCube mode. It also handles patching for GameCube games that have issues running on the Wii.
|v0 is found exclusively on the Wii Startup Disc menu. This version doesn't have many differences compared to v1.
|Found exclusively on Launch Day Wiis and Korean Wiis.
|MIOS v4 is the first update released for MIOS.
|MIOS v5 is meant to block use of the GameCube Action Replay peripheral on Wii hardware.
|An update released to prevent use of the Tweezer Attack exploit.