Browser PKCS12
The Browser PKCS12 renewal process differs only slightly from the standard renewal process.
Renewal takes place via the user’s web browser. The certificate fields are also pre-populated with the previous certificate’s info. However, with this method, there is no way to modify the certificate's info. The user’s browser generates a new key pair and CSR automatically and sends it to the server (which occurs after step 4 in the standard renewal flow.