How do I set up a mesh network with other HUAWEI or HONOR routers?

You can use either a direct Ethernet cable connection or H key pairing. For H key pairing, power on the new router within 1 meter of the connected router — the connected router's LED will automatically change to slow blinking, then press the H key and wait for the new router's indicator to show a steady connection. Once paired, you can move the other routers to different rooms. (Page 1)