Assuming you have a jailbroken PS4 on 9.00 or lower, and you have found a trusted PKG file (not an ISO), follow this workflow:
—as the console primarily uses files for its software—many community sites offer highly compressed versions of popular titles to save on download time. These files are typically hosted on ROM sites like RomsFun and require a jailbroken console or an emulator to play. Popular Highly Compressed PS4 Games ps4 iso games highly compressed link
Highly compressed refers to using algorithms (like ZIP, RAR, or specialized tools like FreeArc or KGB Archiver) to reduce file size. Developers achieve "high compression" by: Assuming you have a jailbroken PS4 on 9
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