So I think the last update actually did fix a major issue…and the product is now acceptable IMO. Install the update. Connect the Bluetooth from the iPhone directly to Tesla screen. Do not connect anything to Hansshow Bluetooth.
Now when I use CarPlay wired I get the audio from calls and music to the car directly via Bluetooth. If a call by accident plays on the hansshow speaker I quickly switch it on the phone which works 100% of the time. Regardless, there is no echo.
The text messages will read from the hansshow screen which is fine…before they would not be audible and that problem has been fixed.
If you still want to connect to hansshow via BT and then hansshow to car yes the echo is still there but this other way works again pretty flawlessly with this new update.
I do not know if it will still work as well with wireless CarPlay but I really prefer not to use wireless CarPlay it is well documented that the streaming of the audio is typically degraded to preserve the video streaming quality.