When you get the Homebrew Channel back, make sure to turn off update checks and don't opt to upgrade your Wii again to prevent this from recurring.
Remove the Homebrew Channel from your Wii by deleting it with the channel manager in the system software.
Not much is known about this update, only that it kills the latest version of Homebrew channel and leaves a question mark in the channel as a place holder.
The latest upgrade version at the time of publication is 4.3.
To find out what version of the operating system you have, go into Wii Options, click on Wii Settings and check the number on the upper right corner of that screen. Now you reinstall the Homebrew Channel for the appropriate OS.
Dagnabbit, this was a nice alternative to having to pull out my NES, SNES, Genesis and other old consoles weekly.
I was looking around in the Wii Shop channel for Rondo of blood and was going to buy it, but the console asked me to update, and said yes, and now it effectively killed my wii system.
"Uh, well last spring-ish (2009), I heard about this game Super Mario War Wii and I wanted to play it, so since you can't run anything on your Wii without this homebrew application that Nintendo does not release through retail or Wii Shop, you can't play it.