If you have lost access to your PLC or HMI, consider these official alternatives:
Maintain a secure, offline record of all master passwords. plc hmi password unlock v42 2021 free
Recent cybersecurity investigations (such as those by ) have found that popular PLC/HMI password-cracking tools often contain the Sality malware . If you have lost access to your PLC
Comprehensive Guide to PLC and HMI Password Unlocking (v4.2 2021) allowing you to start fresh.
If the project file is not needed, you can perform a factory reset (Memory Reset/MRES) to clear the password and the program, allowing you to start fresh.