1. If it cannot be installed, first check whether the unknown source item in the mobile phone system is turned on.

2. Check whether the phone memory is enough. If the memory is insufficient, download the computer version of the application treasure. Connect the mobile phone and computer with a data cable, and you can download the software directly to the SD card.

3. If there is enough memory, there is something wrong with the mobile phone software. You can restore it from the factory. If you don't want to recover, you can download other markets.