How to do the touch screen calibration when screen of LB100 Handheld inkjet printer is not working?

Hello!Dear Friend, When the printer of the touch screen is not working,no worry This is because the screen automatically starts the screen saver mode when the screen is pressed by external force. When this happened,don'y worry Please following the steps in the video to solve the problem when the touch screen of your portable inkjet printer gun is not working Any question you can feel free to contact me Email:[email protected] Tel/wechat/whatsapp:+8613950248969