For developers and enthusiasts, the Downgrade Tool PS4 Repack facilitates the installation of homebrew applications by providing a stable, lower firmware environment.
The PS4 has two "slots" for firmware on its motherboard: Slot A (active) and Slot B (backup/inactive). When you update, the new firmware goes into one slot, while the previous version stays in the other as a failsafe. downgrade tool ps4 repack