You did not eject the USB drive properly or held the trim switch while powering on. Fix: Power off, wait 10 seconds, power on normally.
: Connect your radio via USB (typically in bootloader mode or power-off mode depending on the hardware) and select "Write Firmware to Radio" . OpenTX 2.1.9 opentx 2.1.9 download
Disclaimer: OpenTX is open-source software. This guide is for educational and archival purposes. Always verify firmware integrity with SHA checksums from official sources. The author is not responsible for any damage to your radio due to incorrect flashing procedures. You did not eject the USB drive properly
Before downloading the firmware itself, you must tell the Companion what radio you are using. OpenTX 2
Inside that folder, you will find:
If you have trouble starting the simulator, you might need the Microsoft Visual C++ 2008 Redistributable (x86).