Assuming you already have a legitimate PKG file of Call of Duty: Black Ops 3 (either dumped from your disc or downloaded as a backup), follow these steps.

For on PS3, the .pkg (package) format is primarily used for digital game installations, DLC, and updates on consoles running Custom Firmware (CFW) or PS3HEN . Core Game Information

In this article, we’ll dive deep into what the Black Ops 3 PS3 PKG is, what you can expect from the gameplay, and how to get it running on your system. What is a "Call of Duty: Black Ops 3 PS3 PKG"?