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My One SL is the left speaker in my surround sound system. The other speakers are a beam and One SL. The left rear One SL has be showing updating in the app for days. I have unplugged it and now it will not turn back on. 

Unplug it from the wall, make sure the cord is fully inserted in the One, it can be stiff, and plug it into the wall again.


I did that multiple times with no success. 


Time to call Sonos support and see if they can revive it or get you a replacement.