Signature is a certificate, and the software you want to install can only be installed on your mobile phone with this certificate. Self-signing is to add a certificate to the software yourself. What will happen without it? You can't install software on your mobile phone without signature. When installing, the mobile phone prompts that the certificate is invalid or expired, and automatically exits the installation. So the certificate is equal to your mobile phone's pass to the software. With it, the software is legal and you can install it. Without it, you can't pretend.

To get the certificate, you can submit the serial number of your mobile phone to Cybernet for application. Generally, you can get your own mobile phone certificate the next day. At this time, you need to download this certificate to your computer for storage, and then download the certificate signing tool provided by Cybernet to your computer. Open this tool, add your certificate file, and then add the software you want to sign. After choosing signature software, you will get a software with SISX suffix, which can be installed on your mobile phone.

This is self-signed!