I have used your BT app on my phone for several years and it's been rock solid. I recently updated to 2.6.1.
You can see in the video clip here:
https://photos.app.goo.gl/sEyNSorRYEwnfKVy9 how the crash occurs when you change to the special features option. I'm trying to use the in-flight vibration capture feature on my Channel 7. I can set it up using the USB cable no problem, but changing it in the app is not possible.
I uninstalled and rebooted the phone and reinstalled the app. No difference.
I removed Channel 7 from the Inflight Y axis using the usb. No difference.
Any thoughts?