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The Wii U will brick if you shut it down during an ongoing firmware update.
Ben Fritz, Film business reporter for Latimes, has bricked his Wii U without playing a single game. The reason? Shutting down the system during an update. The size of the update is something that’s not pretty either.
It’s a known fact that many hardware manufacturers tell you not to turn any system off if it’s updating, but there’s always a backup mechanism in place if things go wrong, for example, the PS3 will retry the update as soon as the console starts.
“Warning: don’t unplug your Wii U during the 2 hour plus software update or the console stops working,” he tweeted.
The Wii U firmware update is 5 GB in size and adds the Nintendo Network to the console. Weird way to install a required service, but hey, it’s Nintendo.
~ Source