The main OpenTX website (open-tx.org) no longer directly links to these ancient builds on their front page. However, the project keeps all legacy releases on their GitHub server.
OpenTX 2.1.9 is primarily used for older FrSky and Turnigy transmitters, including: (Non-ACCESS versions) FrSky Taranis Q X7 (Early production models) FrSky Taranis X9E Turnigy 9XR Pro Key Advantages of Version 2.1.9
Important: You must install OpenTX Companion 2.1.9 to download the firmware. Using a version of Companion from the 2.2 or 2.3 branch will not allow you to download the 2.1.9 firmware correctly. How to Install OpenTX 2.1.9 opentx 2.1.9 download
| Area | Fix | |------|-----| | | Changed USB interrupt grouping to resolve SBUS trainer issues (#2999) | | ADC Filtering | Added user‑controllable ADC jitter filter (enable/disable in Hardware settings) | | 9XR-PRO | Trainer inputs >TR4 now work | | External Module | Output type setting is now visible again |
As a deprecated version, active support for OpenTX 2.1.9 has largely shifted to community forums. These are excellent resources for troubleshooting and guidance. The main OpenTX website (open-tx
: Version 2.1 was famous for changing how telemetry worked. If you are "downgrading" to this or upgrading from 2.0, you will likely need to rediscover all sensors.
OpenTX 2.1.x requires a specific SD card structure. Ensure you download the matching SD card pack (version 2.1V0005 or higher). Telemetry Changes: Using a version of Companion from the 2
Ideal for users who prefer a straightforward, classic menu system.
You need the specific software tool to load the firmware onto your radio.
Download the OpenTX Companion for your operating system (Windows, Mac, or Linux).
This comprehensive guide covers everything you need to know about OpenTX 2.1.9, including secure download paths, key features, and a step-by-step installation guide. Why OpenTX 2.1.9 Still Matters