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For S7-300 CPUs (e.g., 313C, 314, 315-2DP) using an (not the old MC Flash card):
This article provides a comprehensive guide to unlocking Simatic S7 200 and S7 300 MMC passwords. It covers the different methods for unlocking the password, including using the SIMATIC Manager software, STEP 7 Micro/ Win or STEP 7 Manager software, and third-party tools. The article also provides step-by-step instructions for each method and answers frequently asked questions. Simatic S7 200 S7 300 Mmc Password Unlock 2006 09 11
Around September 2006, Siemens updated the MMC controller firmware. MMCs produced or formatted this date stored the password in a weaker, reversible format. MMCs after this date used a stronger AES-like encryption tied to the card’s unique ID. For S7-300 CPUs (e
The STEP 7 Micro/ Win or STEP 7 Manager software is another tool that can be used to unlock the MMC password. Around September 2006, Siemens updated the MMC controller