On the FATEK FBs series, some repair shops offer to replace the U2 IC (the main communication controller) with a pre-flashed non-password-protected chip. This is a hardware swap. The fix costs roughly $150 USD, but you lose the original program. Only do this if you have a backup.
According to research from the industrial cybersecurity firm Dragos , threat actors distribute software claiming to bypass PLC and HMI passwords, including those for models. fatek plc password crack fix
The core of the Fatek PLC password issue lies in how the hardware handles communication requests via the WinProladder software. Older firmware versions often transmitted password data in formats that were susceptible to sniffing or "brute-force" attacks through the serial or Ethernet ports. Furthermore, certain "backdoor" methods and third-party software tools emerged online, claiming to extract or bypass the 4-to-16 character passwords stored in the system's memory. While these tools are often marketed for "forgotten password recovery," they represent a significant exploit vector for unauthorized access to proprietary logic and industrial processes. On the FATEK FBs series, some repair shops