Instead of chasing unlock tools for V4.2 systems, implement a secure password policy:
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There could be several reasons why your PLC HMI password is locked. Perhaps you've forgotten the password, or maybe someone else set it and didn't share it with you. Whatever the reason, it's frustrating when you're unable to access your PLC HMI. Instead of chasing unlock tools for V4
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If you have a previous backup of the HMI/PLC program (without password), you can reload it. Always maintain versioned backups.