In the PS4 modding scene, PS4Tool v100 is referenced as part of the ProDG Group 's suite, which provided downgrading tools for early PS4 models (2013–2015). These tools exploited weaknesses in ECDSA key structures to dump system keys, enabling firmware downgrades. However, ProDG's tools are now outdated, as rxTools (developed by the broader homebrew community) has become the standard for newer models like the PS4 Slim and Pro. rxTools leverages the PlayStation Vita's VitaShell tool to exploit firmware vulnerabilities, offering a more sustainable modding pathway.