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You must physically open your PS4, desolder or connect specialized hardware to the Syscon and NOR chips, dump the data to a PC, patch the files to tell the console to boot from its previous slot, and flash the data back.

This article is for informational and educational purposes only. Modifying your PlayStation 4 console may violate Sony's terms of service and warranty agreements. Proceed at your own risk. Ps4 Tool Downgrade V1.00 Download

A hardware flasher device (such as a Teensy 2.0++, Raspberry Pi, or a custom Teensy 4.0 setup). You must physically open your PS4, desolder or