@Marvin_S Hello and thank you for your response. After reading the Ethernet back haul guide you suggested, I found this: Deco switching from Wi-Fi backhaul to Ethernet backhaul may create a short...

When the X20 is connected to the M5 via a TL-SG105, the X20 ethernet ports remain down. My topology is the following: Deco X20-4G ->cable->TL-SG105->Deco M5 (on another floor). Please also note that...