Try this 1
Reset your router. You can find the reset button at the back of your router. You
can use paperclip to push the button. When your router is ON, just hold the reset
button for 30 secs and release it. It will reboot on its own.
(Note : It will clear all the settings you have configured in the router.)
After resetting, connect to your router (through wired) and then configure the
settings. Now try to login to your router using the default user name and
password. You can download the manual from the manufacture website and
follow the instructions to configure your router again.