The PS4 motherboard stores two firmware versions: the active one (e.g., 9.60) and the previous one (e.g., 9.00, if that was your last update). You can force the console to switch back to the previous version using a process called . Requirements : Moderate to advanced micro-soldering skills. Hardware tools like a Teensy 4.0 or a Luxfox Pico module.
Safe Mode will refuse to install a lower firmware. The console will say, "The update file cannot be used (CE-34788-0)." This is a hard block. how to downgrade ps4 9.60 to 9.00