Default gateway problem

Hi all! I have a problem with TP-LINK mr3020 rev 1.9 portable router and its default gateway. I was configured it with static default gateway 192.168.0.1 but I didnt wait till the end of saving that configuration and plug the power off. I have used it before for picking internet connection from my mobile phone hotspot and that works like before but I cannot access to router settings over default gateway 192.168.0.1 or 192.168.1.1. If I connect it with ethernet to my pc and type ipconfig I get the screen where it says it dont read default gateway IP adress. There is ipv4 adress which isnt accessible through internet browser, subnet mask is 255.255.0.0 I dont know what to do now? tapatalk_1556977743041