Panasonic NVR K-NL304K password reset

Hi,

Could any one tell me how can i reset the password for panasonic NVR, as i have forgotten the password and there is no reset button in NVR. NVR model is K-NL 304K.

Apprecitae if any one can help me to get out of this problem.
can also email me the procedure on: sachinkrsharma@hotmail.com