: The file must be named exactly PS4UPDATE.PUP (all caps).
Since the official PlayStation site only hosts the latest firmware, you must source the 9.00 file from reputable community archives.
Before you begin, you must take these steps to ensure your console does not accidentally update to a newer, non-exploitable version. ps4 900 firmware download install
: Common sources include Archive.org or Softpedia . 2. Preparing the USB Drive
: Navigate to Settings > System > Automatic Downloads and uncheck everything. : The file must be named exactly PS4UPDATE
: 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.
The PS4 is very specific about the folder structure and file system of your USB drive. How to Jailbreak the PS4 on 9.00 with a USB (Full Tutorial) : Common sources include Archive
Comprehensive Guide to PS4 Firmware 9.00: Download and Installation
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
: If you have replaced your hard drive, you need the "Recovery" version, which is approximately 1 GB .