This will launch YAWM ModMii Edition unless you are using str2hax without an SD Card (str2hax will launch the HackMii Installer if SD:\boot.elf is not found).

If you don't have an SD Card, the HBC or a Forwarder Channel then either perform an official update to 4.3 and repeat the ModMii Wizard, or get an SD Card, or try your luck and see if the HackMii Installer will run on your Wii as is without first installing IOS58. If you are able to skip installing IOS58 and manage to install the HBC and Bootmii, be sure to also install IOS58 when you get to the Install WADs step later.

Install IOS58 using YAWM ModMii Edition

YAWM ModMii Edition stands for Yet Another Wad Manager ModMii Edition (aka yawmME). A WAD Manager will allow you to install "WADs" containing things like updates and other content for your console, like IOSs, custom IOSs (or cIOSs), or other downloadable content, which can be all packed into WADs and installed to your Wii. Think of a WAD like a zip file but for the Wii.

WARNING: WADs can also be uninstalled, and if you're not careful you can brick your console by uninstalling or even installing the wrong WAD. The WAD Manager you're using, YAWM ModMii Edition, has some extra brick protection built in to restrict someone from doing catastrophic things like uninstalling any System Menu WAD, or required System Menu IOS, or a dozen other things which could potentially result in a brick if you don't know what you're doing. Stick to your ModMii guide and you'll be fine.

1. From YAWM ModMii Edition's main menu choose your source device using left and right, most likely "Wii SD Slot", and Press A.
2. Install IOS58-64-v6176.
   
   • Navigate to the WAD and press the A button 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.
3. After successfully installing IOS58, press any button to continue.
4. Then press the "B" button to go back to the root of your device.
5. Choose "apps" then press A.
6. Navigate to "HackMii_Installer" and press A.
7. Scroll to "boot.elf" and press A again.
8. Press A to launch the HackMii Installer's boot.elf.