Opentx 2.1.9 [2021] Download Guide
OpenTX 2.1.9 is a significant legacy release in the RC radio world, serving as the final stable version for many older transmitters
. Below is a blog post structure you can use, including the necessary direct download links that are often hard to find due to broken redirects on the official site.
The Definitive Guide to OpenTX 2.1.9: Download and Setup for Legacy Radios If you are rocking an older radio like the Turnigy 9X , or the original FrSky Taranis X9D
, 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?
Released in late 2016, version 2.1.9 was the pinnacle of the 2.1 branch. It introduced a completely overhauled telemetry system
that moved away from fixed sensor IDs to a "discovery" based system, allowing for much more flexible setups. Key reasons to stay on 2.1.9: AVR Support: opentx 2.1.9 download
It is the last version to support AVR-based radios (9X/9XR with stock boards). Stability:
For older hardware, 2.1.9 is bug-free and less demanding on the processor than modern branches. Telemetry:
If your model fleet is already tuned for 2.1.x telemetry, 2.1.9 is the most polished version of that logic. Direct Download Links The official OpenTX website
has some outdated links that may lead to "404 Not Found" errors . To install 2.1.9, you need the OpenTX Companion
software first; it will then download the specific firmware for your radio. Companion 2.1.9 Installer Companion 2.1.9 Disk Image Ubuntu/Debian 64-bit Installation Tips companion 2.1.9 link not working · Issue #9029 - GitHub 10 Dec 2023 — OpenTX 2
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
: Version 2.1 introduced a completely new way of handling telemetry, moving away from "frozen" sensor types to a more dynamic system. AVR Support Option 2: OpenTC (OpenTX Community Tool) Former community
: 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
Option 2: OpenTC (OpenTX Community Tool)
Former community member OpenTC maintains a legacy archive. This is useful if GitHub is blocked or slow in your region. However, always verify the MD5 checksum against the official GitHub hash to ensure the file is not corrupted.
Why 2.1.9?
OpenTX 2.1.9 was released back in early 2016. You probably need it for one of three reasons:
- You bought a used radio that still has this firmware, and you want to back up the existing settings before upgrading.
- You have a specific hardware module (older DSM2/DSMX or FlySky) that stopped working after version 2.2.
- You are following a vintage tutorial for a complex setup (like a helicopter or glider) and don’t want to translate it to the new "Companion" interface.
The SD Card Contents
Modern SD cards have a folder structure that changed in 2017. For 2.1.9, you need the specific "2.1Vxxxx" sound pack.
- Download the
sdcard-taranis-x9-2.1v0030.zip(or similar) from the/sdcard/folder above. - Unzip it directly to the root of a FAT32 formatted SD card.
2. Companion 2.1.9
You will need the matching Companion version to configure models and flash the radio.
- Windows/Linux/macOS installers are available under the same GitHub release "Assets" section (click "Show all assets").