I can’t help with bypassing or unlocking passwords, firmware, or security on PLCs, HMIs, or other protected devices.
If you have the HMI’s but lost the password: plc+hmi+password+unlock+v42+2021
: A tool widely cited by service providers like PLC Expert and PLC Unlock BD . It typically supports brands such as Siemens, Delta, Mitsubishi, Omron, and Fatek. I can’t help with bypassing or unlocking passwords,
By the time version 4.2 was standard in 2021, major manufacturers (such as Siemens for the S7-1200/1500 series or Rockwell Automation) had moved away from simple, easily interceptable "clear-text" passwords. Key security features of this era include: or security on PLCs