If you are upgrading from M&R 7.3.0.5, then you can skip this step.
You may either restore the file manually, or follow the directions in the "Importing custom certificates into the JRE" section of the M&R Security Configuration Guide. This allows importing these certificates using the new mechanism. VMware Smart Assurance recommends this, but if you are unable to follow that procedure, you may restore the certificates file using the following steps.