Started rounding up everything I needed to do the firmware update (pc, serial#, etc.) and the last item called for in the updater program was the Pass Phrase that was included with the original unit. I had taken it (small tag) and taped it inside the aircraft log beside the install logbook entry so I'd know where it was in the future. That was last December. Imagine my surprise when I opened the log, found the entry and the tag but the Pass Phrase had completely faded away! UAvionix is helping me to recover it but just a note to everyone........WRITE it down. Don't depend on the printed tag.