This is the most common issue with the NATV variant specifically. If you touch the bottom of the screen and the top registers, or the touch is reversed horizontally, your current driver (kernel) is wrong. A correct flash fixes this.
The is a double-edged sword. Performed correctly, it breathes new life into your Android head unit—fixing lag, Bluetooth drops, and app crashes. Performed carelessly, it can render your radio useless. ums512-1h10-natv firmware update