Go to Settings > Display > Touch Calibration. Tap the crosshairs precisely.
The YT9216CJ Android update process is a powerful tool, but it is not magic. It will not turn your 2GB head unit into a flagship. What it will do is stabilize the software, fix annoying bugs, and occasionally add a few new features. yt9216cj android update
Try the USB recovery method (hold RST + Power). If nothing works, you need SP Flash Tool and a PC to reflash the preloader. This requires opening the unit and shorting test points. Go to Settings > Display > Touch Calibration
A valid update package usually contains two files: If you only have an update
If you only have an update.zip, you are only updating the Android skin. If you have both, update the MCU first.