Several reputable brands include a that erases the project (including passwords) but leaves the bootloader intact. This is not a "hack" but a documented feature.

have found that many "free" PLC password cracking tools are used to deliver malware like System Instability

Searching for "PLC HMI password unlock v42 2021 free" typically leads to various third-party software tools claiming to bypass or recover passwords for industrial hardware like PLCs and HMIs. While these tools are often sought by engineers who have lost access to their systems, using them carries significant risks. Overview of the Software

Using unverified tools can corrupt PLC program memory, leading to operational downtime or permanent loss of ladder logic.

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