To perform this hack, you need an SD card formatted to FAT16 or FAT32. In the following screenshot, we indicate our system menu version (4.3U), input our MAC, and we’ll go ahead and bundle the Hack Mii installer as well.
The size of the SD card isn’t crucial, we found an old 256MB card laying around that is pretty useless as a storage option nowadays, but perfect for this purpose. Next, you enter the CAPTCHA and click “cut the red wire” to download the Letterbomb zip file.
The Homebrew Channel (HBC) remains one the best and well-known console hacks in recent memory. If you have an old “un Brewed” Wii then there’s no time like the present to change that.
After all, the warranty on your Wii is long expired, and you’re probably not doing anything with it anyway.
It allows you to do two things, install the all-important HBC and optionally, Boot Mii. They’re kind of complicated but here’s more information on what exactly IOSes are, just in case you’re curious. You can either use the one already in the Wii, with which you executed the Letterbomb exploit, or you can use another.