Step1: Create a new folder named "updateApk" in the root directory of the U disk

Step2: Put the upgrade file in the updateApk folder and confirm whether the suffix of the upgrade file is .apk. If there are other suffixes, please modify them by yourself, as shown below

Step3: When the prompt window pops out, click “confirm” 

Attention：If the upgrade prompt is not displayed, check whether the upgrade software name is correct in the file browser of the navigation host  

YouTube Video link：https://youtu.be/BN9uBZXH7_A