How do I change the WiFi network name (SSID) on the EX6120?
To change the network name, log in to www.mywifiext.net, go to Settings > Wireless, enter a new name in each Network Name (SSID) field (one for 2.4 GHz and one for 5 GHz bands), and click the SAVE button. Your new settings will be saved and you can then connect devices to the extender using the new network name.
From the official Netgear Range Extender EX6120 manual, page 21
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