What do you mean Bootmii-prepared? Can't I just launch Bootmii through Homebrew channel?
When you install Bootmii then it asks you to put in an SD card which it installs a few things to.
There are two versions of Bootmii, boot2 and IOS. Bootmii boot2 is the one which loads when you start the wii, Bootmii IOS is the one you start through the HBC. Bootmii IOS is pretty much useless for brick recovery, but Bootmii boot2 does not work on all Wiis. Also, Bootmii IOS requires a GameCube controller.