Finally..got the reply from Customer Care support of TP-Link on this matter. Unfortunately this device TD-W8970 does not have the same possibility of WR841ND because it is old product and it will not...

Please let me know, if any other information could be of help. The goal now is to make W8970 working with the same settings as we're configuring WR841ND.

Ofcourse ISP came to set up the box, because they don't share their settings with anybody. Looking at the modem, they said it's good modem, but maybe too sophisticated..simpler versions works fine. I...

Mavis wrote The box is working fine with WR-814ND w/o any additional settings in the router. - Yes, that's correct If so, can you confirm if there are any requirement for the router to make IPTV...

Have you tried to hard reset it? Otherwise, show it to the service centre, could be the damage in electronics. Then decide what is cheaper option, to repair (if that is possible) or buy new one.

Can someone explain me, why two routers, one modem/router W8970 v1 another WR-841ND work differenly in wireless router mode?? I mean, connected both routers using same cabels with the same network...