Most of these files are:
How to Revert the PS4 to a Previous Firmware (Full Tutorial) downgrade tool ps4
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Tools like the Teensy 4.1 or dedicated modules like TNC4 . Most of these files are: How to Revert
You cannot downgrade your PS4 using software alone. It requires specific hardware and soldering skills. downgrade tool ps4
Before attempting to use these tools, several strict criteria must be met: Firmware Revert - ConsoleMods Wiki