It also helps you softmod any wii safely, in addition to bonus features like emulated nand set up and more
Did u try saving that bootmii folder to your sd card like I suggested? Do so, then boot up the wii with it plugged in. If u happened to previously install bootmii as boot2, it will load as long as this folder is detected in SD.
Also if u can access recovery mode using the savemiifrii method u might still he able to recover, but it's not very likely. Basically u connect a GC controller and press all 4 directions on the dpad down at once, u need to take apart the GC controller to do this, if u can access recovery mode then u should be able to autoboot into super smash bros brawl, you'll also need the disk. From there u launch the smash stack exploit from the stage builder (saved to sd card in advance), then u can access homebrew to fix the system menu. I've never personally done this so definitely Google save mii frii for better directions
Edit: to be clear it's unlikely to work, but there's a slim chance if u want to go through all that effort