@Saadyc Sorry, but you have not provided enough information to help you with your issue.

@ferus It should be easy to test your theory on limit for Satellites with Ethernet backhaul: power off "Sam's room" Deco and if what you think is correct "Living Room" Deco, the only one Satellite...

@KM1967 Should not be a problem with adding M9 Plus to your Deco mesh of P7s. They are of the same Deco WiFi5 family, and M9 Plus has newer firmware than P7, meaning you should not be losing any...

@PauloAssumpcao Firmware 1.6.4 does not support IoT Network functionality. To have it on M9 Plus, you'll need to wait till TP-Link releases firmware 1.7.* or 1.8.* for M9 Plus V2. Under normal...

@RouterMess Usually, device such as printer can connect to WiFi using SSID/password combination. What type of printer requires MAC address to connect to WiFi? Can you give its brand and model number?...

@reizeltech Two of your Deco units, Hallway and Office, have firmware that does not support Connection Preference feature. Main Bedroom Deco runs on firmware that supports Connection Preference...