: The PS4 stores two copies of firmware: the current one and the one immediately preceding it. If your console was on 9.00 and you accidentally updated to 13.02, a skilled technician can theoretically revert it to the previous state .

: After successfully downgrading, you might need to reinstall the 9.00 firmware through the recovery mode to ensure a clean slate.

There is no software exploit or USB trick to bypass Sony's signature checks on higher firmwares.

: A full jailbreak is generally available for versions up to 13.00 as of early 2026.