s7_unlock.exe or simatic_pwd.exe : Tools designed to bypass the restriction. Used to manually inspect the MMC image.
If you do not need the program currently residing on the MMC and simply want to reuse the hardware, you can perform a complete memory reset (MRES). This wipes the card clean and removes the password. Turn off the power supply to the S7-300 CPU. s7_unlock
In the early 2000s, engineers often faced "locked" PLCs when original programmers went out of business or passwords were lost. The tools found in these rar files typically performed the following functions: MMC Imaging: Utilities like s7_unlock