OpenTX 2.1.9 remains a critical stable release for many RC enthusiasts, particularly those using older hardware. This version is notable as the final stable release in the 2.1 branch and the last to support AVR-based radios like the Turnigy 9X and 9XR . Downloading OpenTX 2.1.9 Companion
Inside Companion, click the button (downward arrow icon).
: Open Companion, go to Settings > Settings... , and select your specific radio model (e.g., FrSky Taranis X9D+).
Newer OpenTX versions (2.3.x and beyond) have dropped support for very early FrSky Taranis X9D (non-Plus) and a handful of other first-generation boards. If you own one of these classic radios and do not wish to upgrade your internal electronics, 2.1.9 is often the last "official" version that runs flawlessly. opentx 2.1.9 download
OpenTX 2.1.9 was released back in early 2016. You probably need it for one of three reasons:
OpenTX is managed by a desktop app called . Version 2.1.9 requires Companion 2.1.9 . You cannot use the modern Companion 2.3.15 to flash a radio to 2.1.9—the file structures changed significantly.
Select based on your geographic location or if you want to hide helicopter mixing templates. Click OK . Phase 3: Download and Flash the Firmware OpenTX 2
Download the official standard SD card zip file specifically labeled for version 2.1.
Knowing where this version fits in the broader landscape of OpenTX releases is crucial. OpenTX 2.1.9 is primarily used for older AVR-based radios like the Turnigy 9X, while later versions (2.2.X and newer) target more modern hardware.
You downloaded a version with extra options (Lua, Haptic, GPS) for a radio with limited memory. Fix: Use Companion 2.1.9 to compile a stripped-down version: uncheck "lua", "spectrum", or "pseudo_rtc" in the build options before downloading. : Open Companion, go to Settings > Settings
This specific firmware version is most commonly sought after for the following legacy transmitters: (Non-Plus original model) FrSky Taranis X9D Plus (Early production runs) FrSky Taranis X9E (Tray radio) Turnigy 9X (With upgraded telemetry boards) Key Benefits of Version 2.1.9
, you likely know that newer versions of OpenTX (like 2.3.x) often leave these "classic" boards behind. OpenTX 2.1.9 remains the "gold standard" for stability on these devices. Why OpenTX 2.1.9?
OpenTX 2.1.9 was a significant stable release in the lifecycle of the OpenTX open-source firmware for RC radio transmitters. Released on , it served as the final minor update to the 2.1 branch before the community transitioned toward the 2.2 series. Overview of OpenTX 2.1.9