I use a Fuji X-T2 and I've had the 50-140 2.8 for a couple years and love it. I recently picked up a used copy of the XF2X TC teleconverter over an internet transaction. It arrived today, I popped it on the body, mounted the 50-140 and when I turned it on, the LCD started flashing and the camera was clicking.
I was disappointed until I remembered that the 50-140 needed a firmware update to operatewith with the TC, so I downloaded and applied the update (1.00 -> 1.21) to the 50-140 lens but the problem persists! In my head I vaguely remember there might have been a need to apply the firmware updates in a certain order, but I'm not sure and web searches have not been helpful.
Did I get screwed on a dud TC by an internet scoundrel? Or am I just missing something obvious?