Go into the Car settings - Factory settings. There should be an option Touch or similar. You can use this to re-calibrate the touch screen and reverse the mirror effect How To Fix Android headunit touch screen not working - YouTube. cleaning my radio screen and it cause this problem lucky it was an easy fix I figure out.
1. The touchscreen is completely non-responsive, only the physical buttons work 2. The entire unit is non-responsive, both touchscreen and physical buttons. In either case, the only way to fix it is to do a hard reset, and then it's fine.
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    • head unit touch screen not working