@EnzoBarbier You can install this firmware 1.7.0 manually by using Web UI on your browser on phone or PC/Laptop and then you will able to see Connection Preference option in Deco App and then you...

@FC83 You can connect them by ethernet backhaul to get better speed on all Deco units.

@Mukhtiarm Return it to the seller because Deco M4 are always boxed packed in local market which are brand new so it's better to return it to the seller.

@n0zkl3r Just tick this option and also LAN option in the security and Device Access Control. My ONT has only this feature because my ISP not allowed to access all features.

@David-TP Please add these features in Deco M4 too and add option to control Tuya Smart Devices.

@Imrose Update to this 1.7.0 official firmware now. https://community.tp-link.com/en/home/forum/topic/748142