I did the Twilight Hack using the Zelda games to version 4.2u many moons ago. Is there a way to upgrade to the current version without bricking or killing the wii?
Yep. Follow the Softmod ANY Wii guide. There is a link to it below in my signature. Start from the spoiler that says "softmods with homebrew channel installed".
Sent using the WiiHacks app. Please excuse the brevity, punctation, and spelling.