1. Enter relevant information in the dial-up interface to enter the hardware detection mode. Slide down the hardware detection interface to find the touch screen test, and click Enter.
2. Press and hold the leftmost virtual keys (three horizontal keys) in the touch screen test interface, and select touch calibration in the menu that appears.
3. There will be an option to start calibration on the page. Click OK, and don't touch the screen until the prompt of successful calibration appears.