2.1.9 ((link)) Download: Opentx

Companion 2.1.9 can run alongside modern OpenTX Companion on the same computer if you install them in different directories. Use the legacy version only for flashing 2.1.9 firmware.

Pinch the two horizontal trim switches inward toward the power button while switching the radio on. The screen will read . Plug the USB cable into your radio and your PC. Open OpenTX Companion 2.1.9. Click the Write Firmware to Radio icon on the left toolbar. Select your downloaded 2.1.9 .bin file and hit Write to TX . opentx 2.1.9 download

OpenTX 2.1.9 was released back in early 2016. You probably need it for one of three reasons: Companion 2