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OpenTX 2.1.9, released in late 2016, is considered a "legacy" version of the open-source firmware for RC radio transmitters. While it was a stable and significant milestone for its time, it has since been superseded by the 2.2, 2.3, and current EdgeTX branches.
OpenTX 2.1.9 is a stable release that offers several new features and improvements, including:
The OpenTX project keeps older releases on GitHub. You can download version 2.1.9 from there:
If you are currently on an older version and are deciding what to do, here is the verdict: