Anyone can help me with this problem?
Best answer by Ken_Griffiths
Your mobile 'hotspot' device will broadcast a WiFi SSID, whilst it is connected to the internet over a 3G/4G connection.. Before starting your factory reset of your 'up-to-date' speaker, you need to take another 'separate' compatible iOS, or Android, mobile with the latest Sonos controller installed and connect its WiFi to the broadcasting mobile hotspot WiFi signal.
See mobile controller system requirements here...
Sonos System Requirements
Then you can go onto reset the speaker and set it up again. Note, if the speaker is not running the latest update and has not been updated for some time, you may find it will not update, without first cabling it to a router, but try it and see how it goes.
Here is the factory reset process... make sure you press the relevant speaker buttons before powering on the speaker and don’t let go of the buttons until you see the flashing orange light.
Factory resetting a Sonos product
Hope that helps you to get the Play:3 set up and running.?