When you connect your devices to the default Wi-Fi, do you get an internet connection?
You can change the Wi-Fi network in two ways:
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Using the Surfboard Central app: Set up the app using the default Wi-Fi network.
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Using the web interface (GUI): Access the GUI through a web browser to configure the gateway
For the surfboard central app setup, please refer the below link
https://arris.my.salesforce-sites.com/consumers/articles/knowledge/SURFboard-Central-Wi-Fi-Cable-Modem-Setup
To use the web interface (GUI) method, please visit the following link to access the GUI. The first time you log in, you will be prompted to create a password. After that, you can change the network credentials.
https://arris.my.salesforce-sites.com/consumers/articles/knowledge/G34-G36-Web-Manager-First-Time-Login