Nintendo wii not updating
The Homebrew Channel is a channel for launching fan-developed homebrew applications on the Wii.
After the Homebrew Channel is installed, it appears in the Wii System Menu where you can use it to easily install homebrew applications.
An accidental upgrade is most likely to happen if you play a game that includes an update check and you haven't disabled Wii's update checking.
When a new Wii update is available from Nintendo, you are notified, but you can refuse the update.
If you don't refuse, your Wii upgrades and your Homebrew Channel disappears.