I'll try to make this explanation as simplified as possible, but I'm ultimately just reexplaining what the GitHub tutorial says in simpler terms. Since you specifically want Earthbound, I'll specifically go over the steps for that one.
I agree that the audio problems would be nice to fix, but a...
Any visible numbers on the black screen? The Wii U Hacks Guide has some common errors listed if so.
Just tread carefully, if you can. Haxchi, and especially Coldboot, are very particular pieces of legacy software. Make sure your SD Card is formatted correctly for the Wii U (FAT32 + MBR); that...
It's not as easy as just forking the application. The GitHub you linked to was talking about a VC game, not the Masterpiece version. You'll likely just have to learn some hex editing.
The original tutorial you posted is a helpful guide, and probably the best you have. What parts are hard for...
I mean, it's possible, but it's wildly inefficient due to the extra layers of encryption and other modifications Nintendo throws in there. There's no real reason to do this.
If your goal is purely to play Earthbound, then just use NUSspli. It downloads directly from Nintendo's servers, and it's...
Sounds like a formatting issue. You've successfully written the boot info to the motherboard (hence your purple light), but the Wii U fails to load the exploit from the SD Card.
If you haven't already, follow the install guide very carefully if you plan to reinstall. There's also a guide...
Console repair was why I joined the forums myself. I work on computer software way more, so it was foreign territory. Glad to get the help I did, and you'll find a lot more awesome stuff waiting for you on these forums.
Another 30 something year old here, always love seeing new ROM hacks and mods on the site! I've made a few mods for a couple games (right now I'm working on a mod for Prince of Persia), and it's always fun to see what others can do. :yay: