Cytron Technologies

Step1: Install the xinput-calibrator
Run:
cd Elecrow-LCD35
sudo dpkg -i -B xinput-calibrator_0.7.5-1_armhf.deb

Step 2: Execute touch calibration commands
Run:
DISPLAY=:0.0 xinput_calibrator

Step 3:Modify and Save the calibration of Touch parameter
Run:
sudo nano /etc/X11/xorg.conf.d/99-calibration.conf

Tips: Just modify this line, others keep it:
Option"Calibration""3976 132 184 3909"