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5.2 Touch Screen Calibration.
User clicks the OK icon or other place for 5 or more times continuously. It will
enter the touch screen calibration screen. And there is a red dot to guide the
calibration.
Use a tiny pen to click the red dot step by step, then it will back to welcome
screen again after the calibration is finished.
This function is for the issue that the clicked icon doesn’t match the reflecting
place.
The tiny pen must be a dull top in case destroying the touch screen, or
invalidate the warranty.
Never touch the screen too hard or it may destroy the LCD screen
，
invalidate the warranty.
