Things You'll Need
Instructions
If you are running Wii firmware version 3.4, Nintendo can automatically update your system without your approval using the WiiConnect24 service. This update can occur even if you are not currently using your Wii. To disable WiiConnect24, access the Wii settings by turning on your Wii.
Move your Wii remote over the "Wii" button in the left corner of the screen, then press the "A" button.
On the System Settings screen, select the "Wii Settings" icon that looks like a wrench, then press "A".
Click the blue arrow to access the Wii System Settings 2 menu.
Select "WiiConnect24" and press "Off." This will turn off all system updates and communications from Nintendo to your Wii. You are now safe from Nintendo updating your Wii without your knowledge.