To troubleshoot your GoCoax WF-803M not pairing with your Summit Broadband iPhotonix Model 6403, try these steps: 1. Ensure both devices are connected to the same MoCA network and are on the same frequency channel. 2. Reset both adapters to factory settings and reconfigure them. 3. Confirm that the firmware on both devices is up to date. 4. Check that your router settings do not block MoCA traffic. 5. Power cycle all devices and reconnect them. If you'd like to create a quick setup guide or share instructions via QR codes, you can use Make QR. This can make sharing configuration steps easier and more convenient.