1, please check whether the network is good. Please switch to another network and try again, and then try to download and install when the network conditions are good.

2. The application market prompts incompatibility when downloading applications. Please download the required application from the application market. If the application market prompts are not compatible, it is recommended that you consult the developers of related applications (please check the contact information of developers under the application of official website or related applications in the application market) to see if there are applications compatible with your mobile phone version available for download.

3. Clear the data cached by the download manager. Go to settings, search for application management, and then click > show system processes > download manager > storage > clear cache, and then try again.

4. If the internal storage and sd card are full, uninstall some third-party software; If the space is not full, please go to the next step.

5. If there is enough space but the software cannot be installed, click Phone Settings-Advanced Settings-Security-Unknown Source.

6. Turn on "Allow the installation of applications obtained from unofficial channels".

7. Open applications obtained through unofficial channels. If the software still cannot be installed, open Settings-Advanced Settings-Backup Reset.

8. Click "Restore Factory Settings". After the system is restarted, the original installed system will be restored.

9.EMUI8.0: Settings > Applications and Notifications > Application Management > More > Display System Processes > Download Manager, click the Enable button and repeat the step 1.

10. During the download process, the installation package may be damaged or downloaded incompletely due to unstable network connection. Please delete the installation package and try downloading again.

1 1. If the application is installed on the microSD card, please check whether the microSD card cannot be recognized or damaged by the mobile phone. Please reinstall the microSD card and restart the phone, or replace the microSD card. 5. The downloaded third-party application may not be compatible with the mobile phone, so it cannot be successfully installed. Please try downloading other similar applications.

12. Download the installation package from official channels. If the prompt "Installation analysis failed, no signature, abnormal signature, inconsistent signature, attempt to modify system files" pops up during installation, it is recommended to obtain a reliable installation package from official channels.