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.
Downloading random executables from YouTube descriptions or file-sharing forums is dangerous. Here is what you are likely to encounter:
| Threat Type | How It Works | Consequence | |----------------|------------------|------------------| | Fake Payload | Exe that claims to "prepare USB" | Ransomware encrypts your PC | | USB Bricker | Corrupts a recovery PUP file | PS4 enters boot loop (recoverable via safe mode) | | Info Stealer | Steals PSN tokens from your PC's memory | Account theft, credit card fraud | | Time Waster | 2GB download of random video files | No result, wasted bandwidth |
Legitimate PS4 homebrew never comes as a standalone .exe file. It comes as a .pkg, a .bin payload sent via web browser, or a Python script running on a local server.
The PS4 boot process is cryptographically signed from ROM upward. The first-stage bootloader checks the second stage, which checks the kernel. Downgrading requires a flaw in this chain—a "bootrom exploit." While the PS4's bootrom was eventually hacked (the "BD-Rom" exploit in 2024 for very specific models), it cannot bypass eFuse checks on post-2015 consoles.