Things You'll Need
Instructions
Restart the Wii and wait for the BootMii application to load. If BootMii does not automatically load, then it is not installed as the second boot option. If it is installed, proceed to Step 4.
Go to the "Homebrew Channel" and load the BootMii application.
Select the "Boot2" option from the list and wait for your Wii console to restart.
Plug in a Gamecube controller to the first port on the Wii. BootMii will not work with any other Wii controller.
Scroll down to the third selection, "NAND Options," and press "A."
Press "A" again and read the on-screen directions. Wait three to five minutes and the NAND Backup will install to your SD card.
Insert the SD card into your computer, load the SD card from "My Computer" and copy the backup files to your computer desktop. Remove the SD card and insert it back into your Wii.
Load the main menu of the Wii. Select the "Wii Shop Channel." When the channel asks for updates, select "Yes" and wait for the updates to install. Restart your Wii when prompted.
Use the Wii remote to select the "SD Card Channel." Wait for the "HackMii" channel to load and reinstall the "Homebrew Browser." Follow the on-screen prompts and wait for the Wii to restart when the installation completes.
Load BootMii from the Homebrew Channel. Select the "NAND Options" menu. Use the Gamecube controller to select the "Load NAND Backup" icon. Wait for installation to complete and your 3.4E menu will be restored with the errors and extras removed.