This will launch Multi-Mod Manager.
Install IOS58 using Multi-Mod Manager (MMM)
In Multi-Mod Manager's main menu, Go down to select "WAD Manager".
Now install IOS58v6176.
Navigate to the WAD and hit A twice to install the IOS individually.
Be careful not to install any additional WADs that may have been previously saved in this folder (they may be safe, but I cannot say for sure).
Make sure the file installs properly before continuing.
After successfully installing the WAD, use "B" to go back to MMM's main menu and choose "App Manager" then press A.
Select HackMii_Installer using "A"
This runs the Hackmii Installer (and silently/automatically installs BootMii as IOS).
Installing the Homebrew Channel (HBC) And Bootmii
Use the HackMii installer to install the Homebrew Channel (HBC) and Bootmii as Boot2 if possible.