You can try to restore the factory settings or download the required software from the pp assistant computer, download the pp assistant-the data cable connection device-and then successfully install PP on the Apple mobile phone, and then search for the required software. You only need an Apple ID to download and install applications in the AppStore. If you want to install software outside the appStore, you must jailbreak and install the APPSYNC plug-in before you can crack and install the external app.
Digital certificate is a series of numbers representing the identity information of all communication parties in Internet communication, and provides a way to verify the identity of communication entities on the Internet. A digital certificate is not a digital ID card, but a seal or stamp affixed by an identity authentication institution (or a signature affixed to a digital ID card). It is issued by the authoritative organization-CA, also known as CertificateAuthority Center, and people can use it to identify each other on the Internet. The digital certificate could not be installed. You can check according to the following steps:
1. Check your IE security level: You can open IE- Tools-Internet Options-Security-Custom Level-ActiveX controls and plug-ins and set them to start. This is the main place to prevent the installation of certificate controls.
2. If IE is open, you will be prompted to install ActiveX controls. You must right-click to install the controls.
3. If you can't install after setting the above two points, you can check whether the installed antivirus software prevents the installation. Pause antivirus software or enter specific settings.