Solution:
This can only be done on port 8 (the console port). Attach a terminal to this port with communication settings set to 9600 baud 8 N 1 No Flow Control.
Reboot the Jetstream (power-cycle the unit).
When the unit has powered up and initialised itself, the power LED will turn orange for five seconds.
During this time, the in the magic sting shown below :
jgghjrkm (or JGGHJRKM)
and press Return
A login prompt will be presented, and this will set the admin password to default (which is blank) for this login attempt only. Once you have logged in, select a new admin password using the set user command.
If you find that you can’t type in the magic string within the 5 seconds, try mapping it to one of the function keys (not forgetting the carriage-return required afterwards).