Hi,
when I switch on the Vista HCx after connecting it and while the app is already running, it is identified correctly.
But plugging in the device after booting or starting the Garmin Exchanger app when already connected always yields "Garmin not found".
But even when found, I can't transfer anything, because after starting the transfer I get "unsupported device" and the app falls back to "Garmin not found".
The phone is running Android 5.1.
Sometimes the Garmin seems to notice that something is supposed to be transferred (popping up "transfer completed"), but nothing actually arrives there.