Hi
Like in most products of this kind you need to make a factory default reset.
press the reset button for 20-25 s. You will loose most of the settings.
There is a more complicated way. Connect a PC with hyperterminal set to 38400 baud, 8 bits 1 stopbit, no parity, No handshake to COM1. Enter "s" and "1" then you can step true the settings until the password shows. ( this does not work if you have activated COM1 for rotator or something else)
73 de mike