Typically, if a game that requires this IOS is started without it (via brickblocker or a Starfall update skip, for example), then the screen will turn blue and a white-text error message "Error #002" will appear. The Conduit behaves somewhat differently as it will simply display a black screen before freezing.
Installation from the Undercover disc keeps [[System Menu 3.3]] and does not(!) install [[System Menu 3.4]], assuming the user's Wii didn't already have 3.4. On the other hand. The Conduit appears to contain a complete [[System Menu 3.4]] update.
When launching Donkey Kong Jungle Beat(Wii) and Excite Bots with Gecko OS it says IOS55 required when on System Menu 3.2US.