How to set up ios 13 for Apple Trust Software: unlock the phone to the home screen page, open the detailed options list, find the management settings of general functions, find the detailed page describing the file functions, and click the application you want to install. The system jumps out of the confirmation pop-up window, and click Trust at the bottom right of the pop-up window to continue the installation. After the configuration file is successfully installed, the device management function will automatically appear in the iOS 12 system.

According to Apple's closed-source style, Apple needs certificate trust to install non-appstore software, and software developers need to gain Apple's trust and buy certificates from Apple before the software can be downloaded by others. In the case of the subject, the certificate of the software developer has expired, so you only need to wait for the developer to recover the certificate, or you can use the signing software to sign the installation package and then install it.

Delete the old application and download it again. If it meets Apple's requirements, a trust certificate will pop up before downloading or installing. At this time, you can find the equipment management in GM, and click in to see the new certificate of the application.