First, you have applied for a certificate for your mobile phone, and then you need to sign the software, and sign the software. All three are indispensable.

Signature software is a tool, which is installed like other software.

After the installation is completed, open the signature software, find the certificate path and the signature software path, and click self-signature.

A new signature software appears, such as SIS suffix software before SIXX and SIXX after SIXX.

That's it. It's simple.