Sony implemented a hardware-based anti-rollback system. Each time you update, a tiny electronic fuse inside the Southbridge chip is physically blown. The number of blown fuses corresponds to the firmware version. You cannot "un-blow" a fuse. Therefore, a software EXE cannot magically revert a physical fuse.
If your goal is to play older versions of specific games (to use glitches or older exploits), you can use safer, software-based methods that do not require a console downgrade. ps4 tool downgrade v100 exe download work
There is no "magic button" software that can downgrade PS4 system firmware. This specific file is likely a designed to infect your computer. Why "v100.exe" is a Fake Sony implemented a hardware-based anti-rollback system