When you encounter the prompt of "certificate expired" during installation, you can install normally with the following settings: advance the date of the mobile phone by one year and reinstall it. After the installation is completed, just call back the normal date. In addition, it is suggested that you can try to turn off certificate detection, enter the "Program Management" menu "Settings" of the mobile phone, set the "Software Installation Option" to "All Software" and set the "Online Certificate Check" to "Off" to install normally.
If not, there are only three ways to solve this problem:
(1) There are many direct signing tools on the Internet, which are the simplest, but they don't work for high-authority files.
② Cracking the mobile phone is relatively easy, and you need to download the cracking software. You can go to Saipan Forum to find the required tutorials and software.
(3) brush machine, the most difficult, there are certain risks. It is recommended to go to Saipan Forum to find a brush master to help you brush the machine remotely.
Hope to adopt
The official team of mobile QQ will answer your questions.