To disable Wi-Fi on your Arris router:

1. Open your web browser and go to the internal IP address of your device. You can find the IP address and your default login credentials on a sticker on the back, bottom or side of your router.
2. Choose Wireless.
3. Choose Basic Settings 2.4 GHz.
4. Under Status, check Disable.
5. Choose Continue.
6. You have successfully disabled Wi-Fi 2.4 GHz.
7. To disable Wi-Fi 5 GHz as well, choose Basic Setting 5 GHz.
8. Under Status, check Disable.
9. Choose Continue.
10. You have successfully disabled Wi-Fi 5 GHz.