We encounterd a small issue with the Inrico T199 (and probably other screenless devices)
When your screenless device is powered on but idle it might happen that when you push the PTT button nothing happens or if you configured it like below you will hear 3 beeps (meaning error). That’s because Zello changed from specific channel to a default mode. The only thing you have to do is turn your channel knob back and forward to your chosen channel and it wil work again. We are looking for a permanent solution but this is a nice quick fix.
I’ve update this in the manual section “How to configure a screenless device”.