Opentx 2.1.9 Download
Before you hit that download button, you must heed this warning:
DO NOT use the "OpenTX Companion" software meant for version 2.2 or 2.3 to flash version 2.1.9.
OpenTX 2.1 requires OpenTX Companion 2.1. If you try to use a newer version of Companion, you risk corrupting your radio’s firmware or SD card contents.
OpenTX 2.1.9 was released in early 2016 as the final bug-fix update of the 2.1 branch. While years have passed, this version is far from obsolete for many users. Here is why pilots still search for this specific download today:
OpenTX 2.1.9 represents a time when the firmware had matured into a perfect tool for the job. It stripped away the bloat and offered a pure, reliable experience for the Taranis generation.
If you are looking to restore an old radio or keep a classic setup running smoothly, the OpenTX 2.1.9 download is the perfect choice. Just remember to use the matching Companion software! opentx 2.1.9 download
Disclaimer: Always verify you are downloading the correct firmware variant for your specific transmitter hardware. Flashing incorrect firmware can brick your device.
OpenTX 2.1.9 is the final and stable release of the OpenTX 2.1 branch . While it is now a deprecated version, it remains the recommended firmware for AVR-based radios
like the FlySky TH9X and Turnigy 9X due to specific bug fixes for those platforms. Download Links
You can download the OpenTX Companion 2.1.9 installer for your specific operating system directly from the official OpenTX 2.1.9 release page Companion 2.1.9 Installer
(Note: If you have trouble starting the simulator on Windows XP, you may need the Microsoft Visual C++ 2008 Redistributable Companion 2.1.9 dmg : Available in 32-bit DEB 64-bit DEB 32-bit RPM Key Features of the 2.1 Branch Telemetry Overhaul Before you hit that download button, you must
: Version 2.1 introduced a completely new way of handling telemetry, moving away from "frozen" sensor types to a more dynamic system. AVR Support
: This is the last version to fully support AVR-based hardware (9X, 9XR stock boards). Sound Packs
: 2.1 requires a different sound pack structure than version 2.0. Users should download the 2.1-specific sound packs to ensure system voices work correctly. Critical Installation Notes
OpenTX 2.1.9, released in late 2016, remains a pivotal version of the open-source RC transmitter firmware because it is the final stable release to support older AVR-based radios. While newer branches like 2.2 and 2.3 have since taken over for modern hardware, 2.1.9 is still the "gold standard" for legacy equipment like the Turnigy 9X and FlySky TH9X. Why OpenTX 2.1.9 Still Matters
For hobbyists using older hardware, this version is more than just a legacy download; it’s a necessity. Disclaimer: Always verify you are downloading the correct
Legacy Support: It is the last version compatible with AVR-based radios (9X/9XR with stock boards, Gruvin9x, and DIY MEGA2560).
Telemetry Overhaul: The 2.1 branch introduced a completely new telemetry handling system compared to the older 2.0 branch, offering a more unified interface for registering sensors.
Stability: As the final release of its branch, it contains all the cumulative bug fixes and refinements developed over the life of OpenTX 2.1. OpenTX 2.1.9
Once you have OpenTX Companion 2.1 installed and your radio connected via USB:
If you are an RC hobbyist, you know that the software running your transmitter is just as important as the hardware itself. For years, OpenTX has been the undisputed king of radio firmware, offering unparalleled flexibility.
While newer versions like 2.2 and 2.3 have since been released, version 2.1.9 holds a special place in the history of RC. It is widely considered the final, most stable iteration of the 2.1 series—a true "Gold Standard" for many pilots still flying classic setups.
Whether you are looking to update a backup radio or you are curious about this legendary firmware, here is everything you need to know about the OpenTX 2.1.9 download.