@Chow What is the internet connection type? If it is PPPoE, please ensure that the username and password given by ISP are correct. And you can contact them whether the IPTV settings need to be...

@Lars86 Same thread, replied to you on https://community.tp-link.com/en/home/forum/topic/198674

@Rafid_Anjum Thanks for your valued reply. Try to simplify the network diagram. In other words, please connect your main Deco to the modem only and then connect your clients to this Deco, you can...

@Lars86 Definitely sure. You can wait a while for the updates then.

@Toxothrix Thanks for the reply. It seems that the MAC filtering at ISP's end limits the internet access. Cause cloning MAC address does not help, you can give a call to your ISP and ask them to...

@Saint Thanks for the information provided. When the Deco M4 stops working and became red, please connect your computer to the cable modem directly to verify whether you can access internet. In the...