You can write to TP link India Support and they will give the exact firmware and configuration process. It worked for me... THanks

I have read it but if you go through the reply slowly you will understand that it is the firmware update that was installed with the help of TP link tech support. But still connection to internet...

Region : India Model : TL-MR3420 Hardware Version : V2 Firmware Version : Latest ISP : Tata Photon Max Data card Connection problem : I have a MR3420 V2 and I upgraded the firmware with the latest...