If you're trying to connect the printer to Wi-Fi, ensure it connects to the 2.4GHz network. Typically, the Wi-Fi security mode is set to WPA2/WPA3 Mixed Personal (AES) (Recommended). Some devices may struggle to connect to the 2.4GHz network with this security mode, so changing the security mode can make the Wi-Fi more compatible.
You can change the security mode in two ways: either through the Surfboard Central app, if it is set up, or through the web-based interface (GUI).
For your reference please refer to the below link to change the security mode using the surfboard central app and also through the web based interface (GUI).
http://arris.force.com/consumers/articles/knowledge/G34-G36-Unable-to-Connect-to-the-Wi-Fi-Network