Options #2 Preloader/Priiloader
If you have a functional preloader/priiloader you can fix almost any code based brick. To start preloader, hold reset and boot the wii while holding reset. Preloader would start if it was functional. If it fails you should remove your sd-card, and unplug any usb devises, then try again. Preloader will allow you to run a variety of apps to fix your wii. If you bricked you wii while installing a new system menu, preloader was likely removed and you can not use it.