Error 501 when updating Sonos
Error 501 is often related to a Sonos Bridge having trouble completing an update.
If you have a Sonos Bridge in your system, reboot it by unplugging the power cable for ten seconds and then plugging it back in. Wait for the Bridge to reconnect to your system (the LED status light will stop blinking) then try updating again.
Your Sonos system may not need a Bridge to work on your network. After successfully updating, check our Bridge removal article for information on how your Sonos system can connect to your router without using a Bridge.