If you can get to it from a phone then it is hard to say what you messed up.
You can test basic network connectivity with a ping command. Use IPCONFIG /all and make sure the gateway IP is 192.168.50.1, if not maybe you changed it. Be sure your PC is using DHCP and not static IP because if you changed the lan ip the router should give you a different IP but if it is static you must manually do this.
Make sure you can ping the gateway IP. If you can ping but the web browser does not open then you messed something more complex up.
In the end the solution that always works is to do a factory reset. You have to read the instructions but most times it is hold some button as you power on the router. This should then set it...