Hard reset D-Link DGL-4300

Factory reset (Hard reset) Power ON the router. Locate the hard reset button hole on the back side. Put a paper clip in the hole and press down. Watch the LEDs on the front panel and release when all of them blink at the same time. Wait for the router to reboot (30sec – 1min).
Firmware Firmware link
Default username [none]
Default password [leave blank]
Default IP address