I've been running and flying with ER9X for some time. It seemed to mostly work but it also seemed to push buttons on its own occasionally. It even managed to enable a different model on me more than once. My Iris was about a foot off the ground doing circles and the throttle was still working so I just ditched it. It may have all been the cold or bad contacts. I had looked at OpenTX as it seems to be "the thing" right now. The instructions weren't very clear for non Taranis TX models until I played around a bit.
First, just use the companion app... period. I'm currently running
2.0.15. The MacOS build is missing so I used my Linux box. By default it seems to boot in Taranis mode but don't worry. Click through the splash screen. Find the preferences (varies by OS). Make sure to select the radio type and pick OpenTX for 9x board. If you have the same hardware config the build options should include SP22 (Smartiparts backlight - this enabled the reverse mode so that on really is on) and Telemetrez (not frsky) to get the telemetry enabled properly.
Then exit and it will prompt to download the latest and greatest firmware with the config you just selected. Backup everything with a few clicks and then flash the new firmware. Now rebuild your model/radio configuration. Flash the firmware (beware the avrdude 6 computability issues, I just use 5). My battery voltage seemed to be incorrectly calibrated after the update, I'm going to just plug it into my charger, take a reading and then adjust the calibration. OpenTX seems like its more stable but I haven't had as many flights with it yet. I need to make sure RTL is setup to enable on signal loss so I can at least get things back by fully shutting down the TX. Its very scary not 100% trusting your TX. This is just what I did. I make no warranty. I hope this helps people, but you are probably flying an expensive and dangerous vehicle. Please test fly in safe situations.
