Ok, this is a guarenteed way to get nintendo to fix this and not find homebrew or anything on you wii.
9 volt battery
a couple of wires
Open the wii using any of the disasembly guides on the net. Locate the NAND. Take the 2 wires and attatch then to the 2 terminals on the battery. Now take the other end of the wires and start rubbing along the legs of the NAND chip. When you hear a "pop" or start smelling smoke then you start reassembling the wii. Tell nintendo that you did the 4.2 update and your wii started smoking and hasn't worked since.
lol, ok, I already have a few tri-wing screwdrivers. I'm sure a few wires (hopefully copper will do) and a 9-volt battery will be fairly easy to find.
So just so i'm sure i know what your thinking, you want me to damage my friend's already bricked wii so completely and tell him to lie to nintendo so that they pretty much just send him a new or refurbished wii?