How to reset beetle wifi router password for bsnl broadband

Generally there is pin hole button which you can press using a pin to rest router / modem to factory default. Assuming you have Beetle 450TC1 router for BSNL which is given commonly with BSNL connection. See the image below, if your router is this one then simply turn on router and insert pin in small hole says "reset". Keep it pressed for 5-10 seconds and release it. Now your modem / router should be in factory mode.

Attachment 2425
(Click to enlarge)

Now open 192.168.1.1, and enter admin/password to login the administrative interface.