Hi Ahamed,
the best way to reset the password is to use the INI-File. After power on the MPs send 3 BootP/TFTP requests. The parameter for the INI-File is: ResetWebPassword thats all. Use your standard INI-File, add this string, after the system reset you can use Admin/Admin for login. To do this with the reset button you need the Firmware 4.4GA (also some special versions 4.2GA).
lambdanet