@Damuz 

Hi, thank you for bringing up this question and I do believe many users might have the same confusion.

Here is some information for your reference:

1. As for the built-in ISP profiles, you don’t have to use them if you already know what your internet type is and whether you need special VLAN settings or not.

It is mainly for reference and to save your time if you are not sure how to set up your network.

Note: All the profiles have been confirmed with the local service providers and some settings might need to be updated with time.

If you are aware that some built-in files have mistakes, please feel free to let me know.

2. There are two VLAN settings on Deco, internet VLAN and IPTV VLAN.

Based on their names, you might know internet VLAN takes effect during internet configuration, it would not mess up with the LAN settings.

For the IPTV VLAN, with firmware below 1.5.0, like 1.4.x, it refers to the second LAN port of main Deco. So once it was enabled, only IPTV set-up top box could connect to this port.

With firmware 1.5.0 and above, you could pick up any LAN ports on the Deco, except the WAN port as the IPTV port. So other LAN ports are still available for Ethernet connection.

For more details, please refer to this link:

How to Configure IPTV function on Deco?

Note: For HomeShield models, like Deco X90/X68/X60 v3, it is suggested to check the release note to see whether the firmware supports IPTV on the satellite Deco.

Thank you very much.

And please let me know if you have more confusion.