The jumper pins on the ProfiLux 3 is for a reset. If you set a jumper the ProfiLux permanently stays in reset state!

Recovering the firmware with "Flash-FR" is possible only via ProfiLux RS232 port (direct over ProfiLux-ser or with an USB to serial adapter) as menioned in
http://www.aquariumcomputer.com/Foru...ead.php?t=1274

"Error No.006 Unable to open com port" occures if your COM port is used by an other application (maybe ProfiLuxControl still open) or doesn't exist (wrong COM port selected in "Set Environment").