The year 2021 marked a transitional period for PS4 homebrew. While Sony had shifted focus to the PS5, the PS4 still had a massive user base. Firmware 7.55 had been exploited earlier in the year, but the process was notoriously unstable. Many users reported failed exploit attempts, kernel panics, and repeated restarts.
If you plan to use this tool, on your PS4 (disable internet after exploit) or risk a permanent console ban.
Target Keyword Density: “PlayStation 4 Express Tool 1.0 download 2021” – 9 mentions (including title and headings)
: Modifying system software carries inherent risks of hardware damage or instability if improper firmware or payloads are used.
If you are looking at a 2021-era "Express" tool for the PS4, it typically offers streamlined, "one-click" versions of technical tasks: