As I said: "Forget the cable supplied with the radio. That works with FMS and similar only." The serial cable translates the signal to be recognised as a joystick. Reflex doesn't read joystick signals but has it's own interface that does a signal coding and processing in the Reflex way. It works as a copy protection.

If you want to use the serial cable, google for FMS and use that simulator. It's free so there is no extra money involved. There are a few others that can be used as well.