Notice: Sites like HomebrewInstaller, HomebreWare and WiiUnlocker are trying to trick you into buying a guide and software made from freely available applications. Don't get scammed! Almost everything they sell is freely and legally available here. These sites, apart from HomebreWare which is not illegal any more, are illegally redistributing homebrew applications and documentation against the terms of their license, in violation of international copyright law. More information can be found at the HackMii blog post.
Notice: WiiBrew recommends that you do not update your Wii through Nintendo unless there is an immediate need for you to do so.
The current update disables PatchMii and DVDx. If you want to update the Mii Channel you can use CashMan's Mii Channel Updater, this will not update your System Menu to version 3.4.