2. The downloaded third-party application is not compatible with the mobile phone and cannot be successfully installed.
3. The installed application is not in APK format, and Android phones only support third-party applications in APK format.
4. The application is not downloaded from Huawei application market, and the mobile phone is not set to allow applications from unknown sources to download. It needs to be set in the mobile phone to make it install normally.
5. The third-party eye protection software is installed on the mobile phone, which will prevent the installation of the application.