How can I change my router's lan port to wan port?

yeah there was great lightning.
we actually use broadband internet here (with coaxial cable) . My broadband wire was connected into the wan port during the lightning (though there was no electricity in our area in that time) .

Can you confirm what kind of ISP modem/router do you have? Are you sure it's working?

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Solved the problem. I use tp link tl wr 740n. my routers wan port also got damaged. so i created another VLAN (VLAN 2) and set the port 3 "untagged" in VLAN 2 and "off" in VLAN 1. and other ports were set to ''off" except the CPU port. it remained "tagged".

Then i went to network > interface > WAN > EDIT > physical settings > selected interface : eth0.2( VLAN 2).

And everything was solved like a magic. now my ethernet cable is plugged into port 3 instead of the blue wan port.

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You can also take a look at how I did it https://gist.github.com/tiagonmas/48ec43ba281c220e544ca55eea9384cd