Firmware & no downgrade
Firmware & the No-Downgrade Rule
The single most important concept on the PlayStation 4 is that firmware is permanent. Once your console moves to a higher system software version, there is no supported way to return to a lower one. This shapes every decision you make.
Why does this matter so much? Each jailbreak is tied to a specific range of firmware versions. When Sony releases a new update, it typically patches the entry points used by older methods. If you update past a supported version, the door simply closes, and because you cannot downgrade, it stays closed.
The golden rule: never update
If you have any interest in homebrew, do not install system updates. Stay on your current firmware. An update can permanently strip away your only route to unlocking the console, and the change cannot be reversed by any means.
Practical steps to protect your firmware:
- Decline update prompts when they appear on screen.
- Avoid connecting an unmodded, update-prone console to the internet if you are planning to mod soon.
- Never let a disc-based or network installer push a newer version onto the system.
- Confirm your current version under Settings > System > System Information before doing anything.
Because the unlock itself is temporary and re-run on each boot, you are not giving anything up by staying on an older firmware. You keep both the option to use your console normally and the option to run homebrew. Updating sacrifices the second permanently.