Ax5400 wifi work but lan not work

[PikaBiiiiiii]

Hello,

I tried all lan ports already, their led light successfully but my internet still not working. I think its not cable problem since I already switch them to pair my modem or PC, both cable can connect success in Wan port (WiFi work). Any idea? Sorry for poor English.

[plemans]

1. what modem do you have the router connected to? 

2. what actual router do you have? (hint, ax5400 is a speed, not a model)

3. what firmware is on it? 

4. what happens with the hardwired devices when connected? What error do they give?