Model :

Hardware Version : Not Clear

Firmware Version :

ISP : Telefonica-Spain

Hello there
I bought an ADSL2+ Modem with router (TD-W8970) and tried to setup from disk, but the verification fails. After trying it from 192.168.1.1, it seems like the Test PPP connection fails, and I don't know how to fix it. After I put the old Movistar router on to continue with internet in home. Today, it still fails, but trying to go on 192.168.1.1 just gives a 500 Internal Server Error with the ZTE favicon (Movistar router), and sometimes 403 Forbidden. How do I get it back?

Also, I have Movistar+, and I don't think it works with other router. Do I still get all the features if I use the ZTE as a bridge?

Thanks in advance.