Have a look here:-
http://gbatemp.net/index.php?showtopic=171901
Get the Update.zip files, and then do this:-
I cannot stress this enough, people need to read this
one word at a time
The steps seem repetitive & similar at times, but they are not!
Guide is completely offline.
Update to 4.2
Follow this if your not on 4.2 yet, it will update all of your IOS's & System menu to the latest firmware.
Setting up the SD Card
1st download the precompiled link update.zip for your region by emailing
[email protected]
Extract the "update.zip" & put the files onto a SD card & insert the SD card into the Wii.
Installing The Homebrew Channel & Bootmii
Run bannerbomb by going to the Settings, Data Management, Channels, SD Card & choosing yes to load boot.dol/elf
This runs the Hackmii Installer from which you should install the Homebrew Channel, DVDX [optional], & Bootmii as IOS & boot2 if possible.
Update to 4.2
Run Yet Another WAD Manager Mod from The Homebrew Channel.
Scroll down the list to find & install:
*Really important stuff here! Do not skip or alter steps in any way!*
IOS70-64-v6687.wad
& System Menu-NUS-v481.wad [NTSC-J = v480; PAL = v482]
Then proceed to install the remaining 22 different IOS files & Shopping Channel-NUS-v18.wad by pressing + on each one then 1 to install them. It should say 23 files will be installed.
*End.*
You can then erase everything from the update.zip & setup everything from the modify.zip
Advance to the Modify 4.2 section to reinstall The Homebrew Channel so it can run under the correct IOS.