To properly prepare the sd card (i assume you already formatted it, if not follow the link in the supplies list to thundaboys instructable.) you need to make a folder called 'apps' without the quotes and a folder called 'wad' without the quotes. If you are still worried, skip to the last step first to figure out how to install starfall, an application that will allow you to boot the twilight hack and remove the bad wad. if you get a banner brick, it is also not my fault, though if you listen to me exactly and only download wad files for your region wii, that wont happen. Even though the laws get a bit shadey when dealing with downloaded pirated content, DO NOT DOWNLOAD A WAD FILE YOU DID NOT ORIGINALY PAY FOR!!! if you do and get caught, it is not my fault. Now i know what your thinking, 'OK, once i figure out how to do this, i am going to find a website that distributes wad files and install them to my hearts content.' Wrong. In my case, i caught my brother trying to update my wii and yanked the power cables out of the wall, effectively erasing everything on my wii. It is helpfull to know how to install wad files in case some of the channels you bought got deleted. A wad file is usually a file that, once installed, will become a channel, but can also be a patch or something else of the sort like the cios wad file.
In this instructable, you will learn how to install a wad file onto your Nintendo Wii.
