Erk, I have an N289 that might've just run into this problem
I hadn't turned it on in ages, but finally had occasion to pull it out today, and it started downloading the update once I connected to Wifi. Now the update process is stuck after the download completed
Going by
this thread, turning it off might be a bad idea, but I don't have much choice. Maybe I'll give it another hour or two.
I'm surprised they haven't pulled the update, if this has been happening to people since January.