Free signature, the signature software of the Saipan platform, has three functions: signing, self-signing, and de-signing. After signing, the format of the installation package changes from .sis to .sisx.

Sign, use a general certificate and key with general authority to sign your program installation package.

Self-signed uses a unique certificate and key specific to your phone for signature. It has higher permissions and generally unusable programs can be installed through the new installation package obtained after self-signing.

Go to signature and remove the signature of the installation package signed by others.

Two points need to be mentioned:

1. You need to apply for and download your own certificate. The format of the certificate is .key and the format of the key is .cer. Be sure to save it. If you need FreeSigner, please use it and put it on your phone.

2. Open the settings of the FreeSigner software and you may find that there is already a set of certificates and keys in "Self-signed". That is the universal set. They should be "signed", and then you open Sign and find that the certificate and key are empty. Click on your own certificate and use "signature" as "self-signed". If you strive for perfection, you can also move the default certificate key in the self-signature to the signature, and it deserves its name.

I hope this helps, my friend.