Be extremely cautious: There is no legitimate "one-click" software that can downgrade a PS4's system firmware
Downloading a file named "ps4 tool downgrade v100.exe" is highly likely to be a scam or malware. There is no legitimate software-only ".exe" tool that can magically downgrade a PlayStation 4's system firmware through a PC connection alone. Real PS4 firmware downgrading is a complex hardware-based process often referred to as "reverting". Why "v100.exe" Tools are Scams False Promises ps4 tool downgrade v100 exe download work
No true software-only downgrade exists for retail PS4 consoles after a certain hardware revision (CUH-20xx and later). Be extremely cautious: There is no legitimate "one-click"
Console firmware controls core system functions, security, and compatibility with games and online services. Downgrading firmware refers to reverting a device’s system software to an earlier version than the one currently installed. While enthusiasts sometimes pursue downgrades to regain features, enable homebrew applications, or use legacy compatibility patches, the practice raises significant technical, legal, and ethical issues. Why "v100
: There are software tools like RewindPS4 or PS4 Wee Tools, but these are for game versions or assisting with the complex hardware revert process, not one-click firmware downgrades. Real Revert Requirements (Technical)