This tutorial shows you how to hack any region Wii up to 4.3 WITHOUT any games at all. It uses the exploit called LetterBomb which lets you install the Homebrew Channel through a letter in the Wii Message Board.
(If you already know how to get your Wii's WiFi MAC Address, skip to step 2) 1. Go to your Wii's Settings menu. Select "Internet" on page 2. Select "Console Information". Record your Wii's MAC Address for use in the next step.
2. On your Computer, go to this page: http://please.hackmii.com
3. Make sure "Bundle the HackMii Installer for Me" is checked. Select your System Menu region, enter in your Wii's WiFi MAC Address, fill in the captcha, and "cut either wire".
4. Extract the contents of the downloaded .zip file onto the root of your SD card.
5. Insert the SD card into your Wii.
6. Go to your Messageboard (button on bottom-right of Menu) and navigate to "Yesterday" (depending on your timezone, the exploit could show up under "Today").
7. Click on the envelope with the pink "Bob-omb" to run the HackMii installer.