I can't find any instructions - here are a few notes that I can remember.
with a pc connected to the unit via serial port....restart the unit and you will see it boot up in hyperterm (assuming you get the baud rate correct)
you have to interrupt the boot up and then delete a directory (yes, it looks like your in a DOS computer)
edit config file with your call letters and other RDS info
text can be sent to the unit via something as simple as RT = "text" or ps scroll = "text"...