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Either change your ‘new’ network’s SSID and password to the ‘old’ network’s, or temporarily wire a Sonos device to your new router with an Ethernet cable, and go in to the network settings of the Sonos controller, and tell your speakers the new SSID and password.
Either change your ‘new’ network’s SSID and password to the ‘old’ network’s, or temporarily wire a Sonos device to your new router with an Ethernet cable, and go in to the network settings of the Sonos controller, and tell your speakers the new SSID and password.