My uncle recently bought a Wii for his kids, and chipped it to download games.

He's just bought Guitar Hero 4 to play on it, but it seems to require an update to work.
There's a warning with GH4 saying that if you have a chipped Wii, you can have problems etc with it and thusly can't be updated.

He did some searching around and found out about something called "Gecko OS".

I'm here to ask if anyone can shed any light on the situation, and what it might entail.

Thanks, Lewis.