Based on PSCX-Reloaded, this emulator will allow you to launch your PS1 isos on your PS4, but with some restrictions unfortunately.
Indeed, PSCX-R will be able to execute only one iso at a time, you will need to replace your iso on your USB key in order to change the game.
- Install the fpkg PSX.pkg
- Copy / paste your rom in .bin format to the root of your USB key by renaming it game.bin
- Launch PSCX-R from your PS4 menu
- Your game starts
Enjoy 
You must click 'Like' before you can see the hidden data contained here
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