hi there, i've had the same problem, but then i carefully followed the instructions listed hereunder and managed to reset my router (at bloody last!!):
"2) Use the Factory Default Reset button: First, turn off the router's power. Second,
press and hold the default reset button then turn on the router's power, until the
Systerm LED lights up (about 3 seconds). Last, release the reset button and
wait for the router to reboot."
careful to keep the button pressed throughout the process of switching off and turning on the router