There are a few things that are important with the FA50 to transmit. First, must have 12 or 24Vdc power connected to red (+) and black (-) wires. Second, please ensure that you're ship static edit page still has MMSI, ship name and int/ext antenna positions entered. Third, a good GPA017 must be connected and recognized by the FA50. Forth, ensure the purple and gray wires are not touching or that a switch connected to them is not set to enable silent mode. In your case, you have an original FA50 without those wires, so that statement doesn't apply to your install specifically. Lastly, an actual AIS antenna must be used instead of a regular VHF antenna. If all of those things are done and a blue TX light appears intermittently based on your speed, the FA50 is working.
*Of course, the FA50 would also need to be interfaced to something to display the information either via Ethernet to our NAVnet systems or NMEA0183 via the white (TX+) and blue (TX-) wires.
**I don't think updating the software again will help, but if you have a way to verify the software version installed on your FA50 (i.e. TZ Touch display), that would be optimal. If so, please ensure that it ends in 02.02.