Bought used play 3 and tried setting it up on my existing Sonos system. I tried doing the factory reset as the speaker could not be found. Factory reset, unplug for 10 seconds, hold play pause button, plug back in would not get pas flashing amber light. So tried hard line into ethernet (direct to router) and again won’t get past the flashing amber...thoughts?
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Are you possibly letting go of play pause too early? You need to hold it down until it flashes white and orange.
No I tried at lease 5 times without ethernet cord and 5 times with ethernet. The final ethernet time I held it down for 6 minutes!
6 minute yeah that should be long enough 
Not a good sign. Probably best to contact support.
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