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How do you reset factory settings for sonos one speaker 

Here:

https://support.sonos.com/en-us/article/reset-your-sonos-product

 

But please know, you shouldn’t factory reset unless you are selling the unit.  Resetting almost never does anything a simple reboot won’t do, and it erases all account information (not to mention diagnostic info that Sonos can use to troubleshoot what is wrong).