Unofficial PKGs may have missing assets, stuttering framerates, or broken trophies. Black Ops 2 on PS3 already runs at a dynamic resolution (usually 960x544 upscaled); a bad dump can make it unplayable.

PS3 malware is real. Some malicious PKGs are designed to:

If you sign into PSN (PlayStation Network) while having an unsigned PKG installed, Sony’s detection systems can:

On the PlayStation 3, a .pkg file is essentially an installer package, similar to an .exe file on Windows or an .apk on Android. For a game like Black Ops 2, which spans a large amount of data, the PKG format allows users to install the game directly onto the PS3 hard drive without the need for the physical Blu-ray disc.

However, Sony’s official PlayStation Store no longer serves these files directly to the PS3 browser in the same way it used to, and official digital licenses are no longer available for purchase. Consequently, the term "PKG download" in the modern context almost exclusively refers to the Custom Firmware (CFW) or HEN (Homebrew Enabler) scene.