Scammers often promote fake "downgraders" on social media to trick users into downloading trojans or ransomware.
While a system downgrade tool is usually a red flag, there are legitimate tools that use similar names for different purposes: Ps4 Tool Downgrade V1.00 Exe Download
Claims that you can go from Firmware 11.00 straight back to 1.76 instantly are false. You can usually only revert to the version you were on immediately prior to your current one. Scammers often promote fake "downgraders" on social media
Some legitimate tools (like PS4 Toolbox or PS4 Remote Play Injectors) use .exe files. However, none can downgrade firmware. They might send a "downgrade payload" to a jailbroken PS4 on 5.05 to spoof the version number—but this does not actually revert the fuses. Your console remains on high firmware physically. Ps4 Tool Downgrade V1.00 Exe Download