I have a HB810 unit, it seems to have some problems in the physical port connection.

1. Wifi is working (mesh function, broadcast ssid, connectivity, dchp) all good

2. fan is running noise (full speed, non-stop)

3. no lan connection (no ip obtained if lan cable plugged in)

4. no internet (wan) connection (even if lan cable with internet source plugged in) it said no internet connection in the set-up page and the dashboard

My assumption: software bug / firmware corruption

Why is the fan running, I saw from internet said that is SFP port is plugged in, the fan will run in full speed to avoid overheating (which the SFP is never plugged in). I assume the HB810 thinks the internet is from SFP port and disabled the other combo port.

Why no LAN connection. I saw from internet said that if no internet connection, the lan connection will be disable due to some WAN/LAN auto-sensing problem from "[Forum][ID 846818]No LAN if no internet on BE85"

The problematic unit is currently used as child node in a mesh network, wired backhaul is available but not able to use, experiencing excessive fan noise, low speed and higher latency.