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 .
Select based on your geographic location or if you want to hide helicopter mixing templates. Click OK . Phase 3: Download and Flash the Firmware
: 2.1 introduced a major "Telemetry Rewrite." Sensors are no longer hardcoded; you must use the "Discover New Sensors" function on the radio's telemetry page. EEPROM Conversion opentx 2.1.9 download
: This is the last version to fully support AVR-based hardware (9X, 9XR stock boards). Sound Packs
OpenTX 2.1.9 offers a range of exciting features, improvements, and bug fixes, making it a significant update for RC enthusiasts. By following this guide, you should be able to download and install OpenTX 2.1.9 on your radio transmitter with ease. Always be sure to follow the instructions carefully and take necessary precautions to avoid any issues during the update process. Happy flying! Pinch the two horizontal trim switches inward toward
Anyone with modern transmitters (Radiomaster, newer FrSky ACCESS radios) or users looking for current features like Forward Programming, modern touch screen support, or ELRS/Ghost protocol compatibility. Key Features & Stability
: This version is no longer receiving active updates. For most modern use cases, it is recommended to use the latest version available (OpenTX 2.3.15) unless your specific hardware or workflow requires 2.1.9. Open OpenTX Companion 2
This version is specifically recommended for older 8-bit radios (Atmega64/128) as later OpenTX branches (2.2+) focused on ARM-based hardware.
Download Zadig (a free driver utility). Put your radio in bootloader mode, plug it in, open Zadig, select List All Devices , find the STM32 Bootloader , and replace the driver with WinUSB . 3. "Firmware Check Failed" in Companion