@Fabrizio1965 Hi, Since Deco M4 is not supported WPA3, only Deco X60, the WPA 3 security mode is still not available for the whole mesh system; Deco X60 could broadcast 802.11 n/ac/ax standard...

@Jon1961 Hi, could you please provide me a picture of your network topology? Have you checked the IP address on the device connected to the switch when there is no internet? Thank you very much and...

@Marvin101 Hi, I can see your current model number is Deco M5 which has supported the network optimization already. So Was your current issue that the network optimization did not stay on the clear...

@Denarius Hi, thank you very much for your feedback. Have you tried to change the DNS server on the Archer MR600 to have a look: Advanced>Network>LAN settings>primary DHCP server/secondary DHCP...

@Kostas7 Hi, the TL-MR6400 v5 has 2 × Detachable External 4G LTE Antennas. Since we did not test the compatibility with different antennas, it is not suggested to replace the original antennas; And...

@cyriac Hi, it is under : Basic->Internet page or Advanced->Network->Internet page. And could you please have a check again? Thank you very much.