To avoid confusion, there is one legitimate tool that includes "downgrade" and "v1.00" in its name: the ESP8266 Downgrade Payload v1.00 released by modder "Leeful" in 2021. This tool does not downgrade your firmware version. Instead, it:
It does not and cannot revert eFuses. If you download a file called "ps4_tool_downgrade_v1.00_final.exe" – delete it immediately. ps4 tool downgrade v1.00
Skilled modders have soldered wires to the Syscon chip (the power management and security microcontroller) to reset the eFuse counters. Combined with a NOR flash programmer, they can write a clean v1.00 image to the NAND. This requires micro-soldering, a $200 programmer, and hours of work. No all-in-one software tool exists. To avoid confusion, there is one legitimate tool
The "PS4 tool downgrade v1.00" is the modding world’s equivalent of Bigfoot or the Loch Ness Monster. It is a sought-after legend built on a kernel of truth (hardware downgrades exist) and a mountain of scams. Sony’s eFuse architecture ensures that any true downgrade to 1.00 requires physical soldering and a donor console from the first two years of production. It does not and cannot revert eFuses
For 99.9% of users, the search is a dead end. The wise modder accepts this, buys a used PS4 on firmware 5.05 or 9.00, and enjoys the existing homebrew scene without chasing phantoms. If you ever see a YouTube video claiming "PS4 TOOL DOWNGRADE V1.00 100% WORKING 2026," report it, block the channel, and save yourself from malware.
The holy grail remains unattainable—but that has never stopped the internet from dreaming.
Disclaimer: This article is for educational and archival purposes. Downgrading or modifying your PlayStation 4 violates Sony’s Terms of Service, voids your warranty, and may result in a permanent console ban from PSN. Proceed at your own risk.