Modern OpenTX versions (2.3.0+) include support for FrSky’s ACCESS protocol and R9 2019 hardware. If you are strictly using older ACCST D16 receivers, 2.1.9 provides a no-fuss, glitch-free experience without the need to flash receiver firmware updates.

: Version 2.1 replaced fixed telemetry with a "Discovery" system. You must now use the "Discover new sensors" menu item on your telemetry page to see active data.