: You can find archived versions on sites like Softpedia or Archive.org .
This guide provides a comprehensive walkthrough for downloading and manually installing the PS4 9.00 firmware. Prerequisites and Preparation
Firmware 9.00 is highly sought after because it is the latest version compatible with specific "jailbreak" exploits.
: To prevent your console from automatically downloading a newer, non-exploitable firmware, go to Settings > System > Automatic Downloads and uncheck System Software Update Files . Step 1: Downloading the 9.00 Firmware File