@Alexandre. I did the test but it still had the same results... Results of the test: only one DECO M4 in Access Point mode and with enable 5GHz wifi only: Download speed 245Mbps From the MEO router...

@Alexandre. With the deco in Access Point mode I can get 310 Mbps. repeated the test with the MEO router and got 440 Mbps

Main Deco is connected to LAN4 as you said. I also see that something is connected to LAN1 of MEO router, what is it? I have another device (Raspberry Pi) serving as a remote server. "Also, if you...

@Alexandre. MEO router Model is GR241AG Print screen

@Alexandre. only bridge.

@Alexandre. the MEO router doesn't support the gateway mode option. Is there anything else I can try?