1. It is recommended that you download official applications from Google play. To install the installation package downloaded from an unofficial channel, you need to set trusting the program source. Open the Application Information page of the corresponding application, and enable the Allow Application From This Source switch in Installing Unknown Applications.
2. Check whether the memory space is sufficient. If not, clear the space first.
3. Some models support the installation of application programs in an external SD card. If you have set an external SD card, check whether the card can be identified by the mobile phone in the file manager
4. The network connection is unstable, and the installation package is damaged or incomplete. Delete the installation package and try again.
5. The downloaded third-party application may not be compatible with the mobile phone, so it cannot be installed successfully. Please try to download other similar applications.