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The term "unlocking" usually refers to retrieving the source code of protected function blocks (Know-How Protection) or recovering the CPU password from a memory card image.
Unlocking and converting an S7 MMC image is legal if: unlock and converter mmc image s7
The software will scan the binary hex structure of the image to locate the password storage registers (typically found near the block attributes matrix). Click or Find Password .
Set the CPU switch to STOP , then move it to MRES and hold for ~3 seconds until the STOP LED blinks. Release and immediately move it back to MRES for another 3 seconds. This factory resets the CPU, erasing the program and the password. This public link is valid for 7 days
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into your external USB card reader. Cancel any prompt from Windows asking to format the media. Can’t copy the link right now
Siemens sells specialized Field PGs (programming computers) with built-in MMC slots capable of reading these layers. For standard PCs, you must use standard USB card readers combined with raw image-dumping utilities. 2. How to Read and Image an S7 MMC
Go to and select your newly generated .wld file.
Configure your PG/PC Interface in Siemens Step 7 to point to this virtual hardware slot.
FRP is stored in the persistent partition (usually hidden). Steps to unlock: