Connect your DualShock 4 controller to the console using a USB data cable and press the .
The Ultimate Guide to PS4 9.00 Firmware: Download, Installation, and Jailbreak Setup ps4 900 firmware download install
Installing an older firmware is only possible if your current firmware is than 9.00. You cannot "downgrade" from a higher version (like 10.00) using this method. Plug the USB drive into your PS4. Connect your DualShock 4 controller to the console
Never connect to the PlayStation Network (PSN), as it will force a system update prompt. Plug the USB drive into your PS4
If you are on and wish to explore this path, thorough research on dedicated modding forums is crucial before proceeding. The scene is based on using custom DNS servers and USB drives.
Since the official PlayStation site only hosts the latest firmware, you must source the 9.00 file from reputable community archives.