Hello,
Are you able to access router's WebUI login page by 192.168.1.1 at all?
Are you able to access the router via CLI/SSH, as instructed here?
If you are, in CLI/SSH execute following commands:
This should reset your device to factory default settings.
Otherwise, try factory reset by any means provided here.
If that still does not let you to access the router, you can try recovery via bootloader menu, as provided here.
Best regards,