@Roy-B Thanks for the picture. It is clear for me now what you have. It is also clear why your laptop won't get WiFi signal when you turn Office Deco off as I asked: too many walls between it and...

@cstmgl If you want to configure your home network like this, it should work: Still, you may be adding unnecessary complexity by running Deco in Router mode, behind ISP Router. Also, you are not...

@EricBoy From the TP-Link FAQ article: "The Deco Ethernet backhaul feature is based on the standard IEEE 1905.1 protocol. If you're not sure which switch to use, TP-Link switches may be a good...

@Loonzai You can check in Deco app how your mobile devices are connected: do the use 2.4GHz or 5GHz, for each of devices. If Deco app says device is connected with 5GHz, it is connected with 5GHz....

@EricBoy > If the new firmware can let me to select or set the signal source, I think the problem is resolved. It will not. Deco on its own prefers Ethernet connection and only switches to WiFi...

@Roy-B That speed test result tells me your home office edge X20 may not be placed optimally. While Satellite X20 covers your home office with strong WiFi signal, its connection to Main Deco is weak...