: This typically works for older hardware. Newer units manufactured after 2007 often use encryption that makes this method much more difficult. 2. Physical Memory Reset (The "MRES" Method)
If the program logic is not needed and you only need to reuse the hardware, you can reset the PLC: unlock password plc siemens s7 300 rarl better
: If you have the original project backup, you can change the password in the Protection tab of the CPU properties within SIMATIC Step 7 or TIA Portal and then download the new configuration to the PLC. II. Factory Reset (Losing the Program) : This typically works for older hardware