The upgrade file is in the attachment. After unzipping, there is a folder named "NewGMC":

    1. Copy the "NewGMC" folder to the SD card root directory.

    2. Insert the SD card into the SD card holder of the machine, press "Power" to boot,

        the Application Update interface will appear on the machine interface, press "OK" to upgrade.

    3. After the upgrade is completed, the machine automatically enters the main interface.