1、Copy the upgrade software (IAP file) of the corresponding protocol box to the root directory of U disk, plug the U disk into the USB interface of the navigation host, and confirm that the host has recognized the U disk.

2、This pin of the connector must be grounded（If this line is not connected to ground, CAN bus updates will not work.）

3、Click Settings-System Settings

4、Click CAN bus update

5、Select the iap file to be upgraded

6、Click Update，The progress bar is completed, indicating that the upgrade is successful

7、Check the CANbox version number：Settings-System Settings-System Information-CAN bus interface

YouTube Video link：https://youtu.be/3e4EBeSlRCo