Nintendo has to make provisions for the Wii owners a new development to days. This is version 4.2 of the Wii Menu. The Wii Menu is the interface that allows users to run the game is present in the Wii or channels (eg Channel Wii Fit). Unlike other updates, it does nothing in terms of new features.

What does this update good for? Only to fight against piracy. Indeed, the latter will inactivate the launch of homebrew applications (games and programs amateurs). Furthermore, the updates will erase any content deemed illegal by Nintendo.

Because unauthorized channels or firmware may impair game play or the Wii console, updating to Wii Menu version 4.2 will check for and automatically remove such unauthorized files. In addition, there are some behind the scenes enhancements that do not affect any prominently-used features or menus will aim Improve system performance.
According to some feedback on the forums of Nintendo, this new version of the Wii Menu render inactive certain consoles where illegal content was found. However, where there problem is that it would also inactivates some consoles with no illegal content.