v4.2 exploits known vulnerabilities in certain firmware versions. For instance:
For PLCs with 4-digit numeric passwords, the software can rapidly cycle through 0000-9999. v4.2 reportedly uses an optimized algorithm that reduces time from hours to minutes.
[Link Removed for Safety] (Note: Users are advised to scan the file before running. Mirror links are appreciated.)
Please note that due to the nature of this software (accessing hardware registers), some antivirus software may flag it as a "HackTool" or "PUP" (Potentially Unwanted Program). This is a false positive, but always exercise caution.
⚠️ DISCLAIMER: This post is for educational and recovery purposes only. Unlocking PLCs that you do not own or have authorization to modify may violate intellectual property rights or industrial safety regulations. Always ensure you have a backup of your program before attempting any unlocking procedure. The forum and the poster are not responsible for any damage to hardware or loss of data resulting from the use of this software. all plc unlock bd software v4.2
User Comments/Replies:
User1 (TechMaster): Thanks for the update! Does this version support the S7-1200 with firmware v4.5? The previous version (v4.1) had trouble connecting to the newer Siemens CPUs.
User2 (Automation_Guy): I just tested it on a Mitsubishi FX3U. Worked perfectly. The interface is much snappier in this version. Good share.
User3 (NoobEngineer): The download link is dead. Can you please re-upload to MediaFire or Google Drive? The rapidshare link is blocked in my region. ⚠️ DISCLAIMER: This post is for educational and
User4 (OP):
User3 wrote: The download link is dead. Re-uploaded to a new mirror. Check the main post. Cheers!
User5 (SafetyFirst): Warning: I ran this in a sandbox. It tries to ping an external server in the background. I would recommend blocking this .exe in your firewall before running it to be safe.
The "brute force" method can corrupt the PLC’s operating system. If the software writes to the wrong memory address, the PLC may fail to boot entirely, requiring a costly replacement (or a chip-level repair). but always exercise caution.
Many lower-end PLCs store the password in a specific, unprotected memory register. The software sends raw hex commands to read that register directly. For older PLCs (Siemens S7-200, for example), the password is often stored in plaintext in EEPROM.
For more modern PLCs, the software attempts to force the CPU into a safe boot mode that ignores user passwords.
A tampered PLC can no longer be considered SIL (Safety Integrity Level) certified. If that PLC controls a burner management system or a press brake, you are legally liable for any injuries.