Providing the homebrew_launcher.elf is in the homebrew_launcher folder that all looks correct. Like others are seeing the exploit is unreliable to essentially keep trying. After the first successful exploit launch it should be a lot more reliable. In previous posts I have listed a few tips you can try, as have other people. Again any tutorial that requires a game is for the Wii not the Wii U, however some do work on the Wii U's "Virtual Wii" which is what i'm thinking is confusing you. Think of the "Virtual Wii" as like a Virtual PC, if you hack that you are not hacking the Wii U, just an emulated Wii. The only currently released hack for the Wii U requires the web browser as an entry point. As to why it's so unreliable, its a race attack, it's racing to exploit the Wii U before the Wii U blocks it from doing so, for a lack of a better way of explaining it. Once it's successful i presumed this is logged how the attack succeeded which is why is becomes a lot more reliable. I can't really explain any better as i don't know the technical details of how the exploit works, beyond that.