Hello! May I ask what model of mobile phone you have? There are two ways to solve the problem when the mobile phone prompts "Certificate Expired":

1. Just adjust the time on the mobile phone to the valid period of the certificate (generally set the current time on the mobile phone back one year) You can install it successfully. Just set the time back after installing it.

2. To re-apply for the certificate, I will introduce you to a better mobile software website - Paojiao.com (cer.paojiao.сn mobile login). The application speed is very fast. Log in to the application page and just submit Just use the serial number (press *#06# in the standby interface of the mobile phone to check the serial number of the mobile phone). The website will apply for the certificate twice a day (9:00 and 17:00), and the operation is very simple.

To download mobile software, we also recommend Paojiao.com. This website provides all practical software tools needed for smartphones for free.