@TP-Link Many Thanks. Bang on. It was IP TV Setting. It is working fine now. Case 1(the most common one): IPTV for Set-Top box If you have subscribed to the IPTV service from the service provided,...

@BAC Here are my 5 cents... I installed Deco M5 pack yesterday for the client. I found the second ethernet port on the main unit doesn't work. But the ethernet ports on two slave/extender units work...