Do you have a of PLC/HMI you are trying to unlock?
Engineered to be accessible, allowing technicians to quickly unlock files with minimal, straightforward steps.
Turn off programming access over legacy serial interfaces if your system relies entirely on secure network links. Plc Hmi Password Unlock V4.2 -2021-
The V4.2 software compilation gained significant popularity in the automation community due to several targeted functionalities:
Open your Windows Device Manager to identify which virtual communication port your USB-to-Serial converter is using (e.g., or COM4 ). Do you have a of PLC/HMI you are trying to unlock
How do I set a password for projects on HMI? - Delta Electronics
Beyond malware risks, password recovery tools themselves can harbor inherent weaknesses. In October 2025, a vulnerability (CVE-2025-61977) was discovered in AutomationDirect's Productivity Suite software (version v4.4.1.19), where a weak password recovery mechanism allowed attackers to decrypt encrypted projects by answering just a single recovery question. Security researchers have strongly advised users to upgrade to version 4.5.0.x or higher and to implement network segmentation and firewall rules to mitigate such risks. The V4
: For more sophisticated protections, tools may exploit known vulnerabilities or access memory regions via communication ports. On Siemens S7-200 systems, for example, the CLEARPLC password acts as a universal clear password, though executing it erases all protected content.
Exploiting outdated hash algorithms used in firmware prior to modern secure boot integrations. Decodes hashes back into plaintext strings.
These tools are often distributed through unofficial channels and can contain malware or trojans that compromise your engineering workstation.
: Designed to support password recovery for a wide array of HMI and PLC brands, including major names like Siemens , Mitsubishi , Omron , and Delta .