@Charmeng Hi, welcome to the community. It is ok to plug the M8550 directly into the wall socket without a battery. Best regards.

@tomkao Hi, thanks for the update. May I know your internet service provider? Can you send some screenshots showing that "only the primary DNS address was assigned, but the secondary DNS address was...

@Einclad Hi, thank you very much for your time and patience. I'm afraid Deco App doesn't support displaying the Ethernet Backhaul speed. If it is lower than 1G/s, there will be a pop-up error notice...

@Cibik002 Hi, thank you very much for the feedback. May I know your SIM ISP? As the OP mentioned, NE200-outdoor also randomly restarts itself. How about your devices? Have you observed the router...

@Kabeljauws Hi, thank you very much for the feedback. May I know your SIM ISP? Have you observed any LED changes on the Archer NX200 when the router dropped out? Did it help improve the network...

@EyeloMilo Hi, thanks for the update. The Mu-MIMO and OFDMA are enabled by default on the Deco XE75_v2_1.3.0. These two features are clearly mentioned in the product specification:...