Continue holding the MRES button until the STOP LED flashes rapidly (approximately 5–10 seconds).

There are two common categories of such tools:

For high-stakes recovery scenarios where the PLC runs a modern firmware version and the original code is worth thousands of dollars, software cracking is impossible. Specialized hardware reverse-engineering is the only remaining option.

When system integrators hand over a project, make the documentation of all system passwords a mandatory milestone for final payment.

If you absolutely need the code without wiping the PLC, you aren't looking for a "password hacker." You are looking for a "Memory Read via Backdoor Bootloader." This requires specialized hardware (JTAG/BusPirate) and advanced firmware knowledge—it is rarely cost-effective for a single $200 PLC.

Users can upload and view the program blocks, system blocks, and data blocks without a password. However, a password is required to download modifications or overwrite the existing program.

Disables the upload capability entirely. The program cannot be read out of the PLC under any circumstances, even with a password. It only allows firmware updates or complete clearance. Technical Methods for S7-200 SMART Password Unlocking

Select (System Block, Program Block, and Data Block).

These tools often exploit vulnerabilities in older firmware versions or intercept communication packets during a read/write request to extract the password hash or plain text.