In the Web UI, you have two ways to change the SSID and password of your router:
• By using the Quick Settings
• Or by using Wi-Fi Settings.

 Let's focus on the first case, changing the Network Name (SSID) and Password by using the Quick Settings tab in the Web UI.
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Once you have changed the Network Name and Password of your router, the QR code will not work anymore as the connection information of your router will be different.