Wii Homebrew Guide

LetterBomb Guide

LetterBomb is an exploit capable of launching homebrew from the System Menu version 4.3. It was created by Tueidj to replace Bannerbomb, which does not work on System Menu 4.3.

The exploit works by using a malformed Wii message to crash the Wii Message Board and run code to load the boot.elf placed in the root of the SD card. It can be used to install the Homebrew Channel and BootMii via the HackMii Installer.


LetterBomb (The HackMii Installer is included with LetterBomb; leave the box checked that says "Bundle the HackMii Installer for me!")

See the guide below for how to download the exploit.

What you need:


  1. Find your Wii's WiFi MAC Address. Go to Wii Options --> Wii Settings --> (Go to page 2) --> Internet --> Console Information. This is needed because the Wii will only accept messages addressed to its specific MAC address.
  2. Enter the MAC address on the LetterBomb site and select the correct region of your Wii. Enter the captcha and click either of the buttons.
  3. If your SD card has a "private" folder, rename it temporarily, e.g. to "privateold".
  4. Copy the LetterBomb "private" folder to the root of your SD card.
  5. Take the HackMii Installer "boot.elf" and copy it to the root directory of your SD card. (Root means not in any folders, just on the SD card.)
  6. Put your SD card in your Wii and turn it on.
  7. Go to the Wii Message Board and wait a little bit for the messages to load. LetterBomb should be wherever "today" is but depending on your time zone it can be on "yesterday" or "two days ago".
  8. Click the letter and the homebrew on your SD card will load. Enjoy!

Continue Below

Helpful Pictures:

Here's what your SD Card should look like.


Finding the MAC Address

Open the Wii Options menu


Go into Wii Settings


Go to the second page and then Internet


Go to Console Information


Copy down your Wii's MAC Address


Go to the Wii Message Board and click the red letter


Some Wii's have MAC addresses that don't match with Nintendo's list of MAC addresses (for example 00:1A:E4:xx:xx:xx or 0e:0c:7f:xx:xx:xx will not work). The workaround for these Wii's is to use Wilbrand rather than Letterbomb.


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