I understand you're looking for information on bypassing or unlocking PLC and HMI systems, specifically referencing terms like "v42 2021 free." However, I must strongly caution you: attempting to unlock or bypass passwords on industrial control systems (PLCs/HMIs) without explicit authorization is in most jurisdictions and can lead to severe consequences, including equipment damage, production downtime, safety hazards, and legal liability.
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For legacy PLCs (not v42 2021), some professional recovery services can extract a memory dump via JTAG or EEPROM readers. This requires physical access, specialized hardware (e.g., Segger J-Link, CH341A programmer), and often a custom script to brute-force the hash. This is and costs $500–$3000+. I understand you're looking for information on bypassing