@tp_gandhar may seem stupid but try changing the ethernet cord or try using lan 2 using same cord to check if it works?

@tp_gandhar do a full reset of the router after removing the optic cable .

I have installed v .1.13 and have not faced any issues but before updating to v1.13 do install v 1.12 which will be there in the zip file.

Yeah finally, but i couldn't understand why didn't it work when i cloned the mac address of previously working isp modem

I am not sure but i think there was some issue with the mac address as the Mac of my isp provided modem was xx-xx-xx-xx-55 but in their website where we check usage it showed xx-xx-xx-xx-5e. So when...

Got ISP to setup the router. He added the mac from TP link. I think there was some issue with cloned MAC.