The PS4 is natively capable of playing PlayStation 2 games via emulation (this is how Sony sold PS2 Classics on the PlayStation Store). Modders utilize tools often dubbed to take PS2 ISO files, wrap them in a PS4 emulator wrapper, and sign them as a PKG file.

: The PS3 uses a unique "Cell" processor, while the PS4 uses an x86-64 architecture. Because they speak entirely different "languages," a simple file conversion (PKG to PKG) cannot make the code compatible. Lack of Emulation

Load the Linux payload on your PS4 and boot into the Linux environment using a keyboard and mouse. Installation: