1. It may be that the memory of the mobile phone is insufficient, so that the application cannot be installed successfully, and the data structure inside the downloaded application is damaged, so that the application cannot be installed successfully.

2. You can go to a large software market to download applications again, such as Baidu Mobile Assistant, restart your mobile phone or enter recovery mode to clean up the cache. When the mobile phone is completely turned off, press and hold the volume down+power on button for about 8 seconds.

3. enter the program management-options-settings of the mobile phone, set the installation software to all, set the online certificate check to off, re-sign the unsigned software before installing it, and then install it after checking the machine.