Unable to connect MTS ac2766 with TP-Link 3420

[sameer.kool23]

I have unlocked mts ac2766 datacard and when I try to connect it via TP-Link wifi router it doesn't connect. If I connect datacard direct to laptop then it got connect immediately...no issue But it doesn't connect via router. My Prathvi modem has no issue whether I connect it direct to laptop or through router. The issue is here MTS modem connection with router. However if I restart my modem 5 or 6 times then may be it gets connected once so I have to do lots of effect to connect it through router. I have updated to lastest firmware. Also TP-link support tech says they don't support for unlocked modem.
Any help please ?

 

[Shrisangram]

I have unlocked mts ac2766 datacard and when I try to connect it via TP-Link wifi router it doesn't connect. If I connect datacard direct to laptop then it got connect immediately...no issue But it doesn't connect via router. My Prathvi modem has no issue whether I connect it direct to laptop or through router. The issue is here MTS modem connection with router. However if I restart my modem 5 or 6 times then may be it gets connected once so I have to do lots of effect to connect it through router. I have updated to lastest firmware. Also TP-link support tech says they don't support for unlocked modem.
Any help please ?

Factory reset router then setup router again

 

[sameer.kool23]

I did that already. Didn't solve the issue

 

[vidyut]

are you using v2 router ?
if yes, then use this firmware http://www.megaleecher.net/sites/default/files/images/mr3420v2_en_3_13_27_up_boot(121212)Beta.rar

 

[Shrisangram]

I did that already. Didn't solve the issue

First do the factory reset then in quick setup select country India & ISP MTS save setting then reboot router
After reboot goto networks>3G/4G>advance setting>tick mark on set up dial number
Dial Number #777
APN leave it blank
User name cdma
Password cdma
Save and reboot