@Mish88 Hi, the following FAQ will provide detailed struction: Adding an additional unit to your TP-Link Deco network

@outtierrose Hi, here is the latest firmware, and please update to the latest firmware to manually choose security mode: Deco M9 Plus(EU)_V2_1.5.1_210126

@JackHammer Hi, Jack, Thank you very much for the detailed information. After checking with the senior engineers, we don't think it is related to the CA certificates either. Neither Deco M9 plus nor...

@U43spn @RaulSoft I think it is related to QoS and have you enabled the QoS setting before?

@RobynRAZ Hi, each unit would broadcast its own wireless network. Have you tested each unit via smartphone by standing next to the unit? --if yes, would all units have the same issue or just one Deco...

@Tigra.UA Hi, It is difficult for me to give an answer since I would not be informed of the release date in advance either. Thank you very much.