The PS4 homebrew community is active. While 9.60 is not currently jailbreakable, exploits often take months or years to develop. If you update to 10.00 or higher, you will move even further from a potential exploit.
Many enthusiasts look for "low firmware" PS4s on secondary markets specifically to get version 9.00. If you want to try the PPPwn method , I can help you check: If your specific 9.60 build is currently supported What hardware (Ethernet cable, PC/Laptop) you need Where to find the current stage files for your version 60 console is compatible with the latest exploit tools? how to downgrade ps4 9.60 to 9.00
You can typically only revert to the firmware that was immediately preceding the current one. If you updated directly from 9.00 to 9.60, a revert may work. If there were other updates in between (e.g., 9.03), you might only be able to revert to that intermediate version. The PS4 homebrew community is active