This problem is easy to solve. Set the time of your mobile phone system back to half a year. If not, adjust for another six months, but don't overdo it. Otherwise, the certificate will not take effect. After installation, just adjust the time of your mobile phone, and it will not affect the operation of the software because of changing the time. 2. If the theme certificate expires, you can use UNSIS to release the theme to the theme folder, and the computer settings will display hidden files. Connect the computer with a card reader or data cable (the mobile phone selects the data transmission mode when connecting), and copy it directly to the memory card10207114 \ import.