Downgrading a PS4 from firmware version 9.60 to 9.00 involves several steps and requires specific tools. Please note that downgrading your PS4's firmware can potentially brick your console if not done correctly, and it may also void your warranty.
Downgrading PS4 9.60 to 9.00: A Step-by-Step Guide
Myth: "Just download the 9.00 recovery PUP and install it via Safe Mode."
This process is not a simple software update via USB; it requires micro-soldering to interact with the console's internal chips. Essential Requirements for Downgrading
The PS4 homebrew community is active. While 9.60 is not currently jailbreakable, exploits often take months or years to develop. Do not update further. If you update to 10.00 or higher, you will move even further from a potential exploit.