If you are locked out, contact the hardware manufacturer. They often have official (though sometimes paid) procedures to verify ownership and reset or recover access.
The "V2.3" designation typically represents an aggregated suite of scripts and exploits. Unlike official manufacturer software, these are third-party tools that exploit known vulnerabilities in the communication protocols of older hardware. Common brands often targeted by these suites include: (S7-200, S7-300) Mitsubishi (FX series) Delta (DVP series) Omron (C series) Schneider (Twido/Modicon) The Risks: Security and Stability All Plc And Hmi Password Unlock Crack V2.3
Regularly change passwords, especially for critical systems. If you are locked out, contact the hardware manufacturer