| Platform | Download Link | | :--- | :--- | | | companion-windows-2_1_9.zip | | macOS | companion-macosx-2_1_9.zip | | Linux DEB (64-bit) | companion21_2_1_9_amd64.zip | | Linux DEB (32-bit) | companion21_2_1_9_i386.zip | | Linux RPM (32-bit) | companion21-2_1_9-i686.zip |
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.
For hobbyists using older hardware, this version is more than just a legacy download; it’s a necessity.
A common mistake is downloading the firmware but forgetting the SD card files. The firmware is just the "brain," but the SD card holds the sounds, icons, and scripts. Make sure you download the "SD Card Contents" that match the 2.1.9 release to avoid "Missing Version" warnings or silent voice alerts.
Remember to before any firmware operation, and when in doubt, consult the detailed user manuals and community threads linked throughout this article.