According to some users, their Wii U has been bricked (aka, it’s stopped working entirely) because they turned off the power while it was in the middle of the updating process. Consider this a warning to avoid doing the same. Be patient and let the update finish.
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http://feeds.feedburner.com/~r/WiiUBlog/~4/ku95I6xFY0cView and comment on the full article at Wii U Blog
