Took a look at frsky homepage and found new firmware version for the rxsr fport edition come out this year: 2019-01-09
Just download it copy it to the sdcard on the Taranis under Firmware, wire it like on this picture, go into the Menü -> 2/9 SDCARD/Firmware and choose right version -> select flash external device, wait for loading screen -> done
If you have a normal X9D Taranis take a look oscarlians blog. Be aware the power supply/red pin is not in middle, so you have to adjust the wiring.