: Go to Settings > System > System Information . Ensure your version is lower than 9.00 . If it is already higher, you cannot downgrade to 9.00.
Comprehensive Guide to PS4 Firmware 9.00: Download and Installation ps4 900 firmware download install
Updating your PlayStation 4 to is a specific requirement for many users, particularly those interested in the homebrew and jailbreak scene. Because Sony's automatic updates will always push the newest available version (which is currently well beyond 9.00), you must perform a manual update via USB. Essential Preparation : Go to Settings > System > System Information