into your external USB card reader. Cancel any prompt from Windows asking to format the media.
When a password is set in an S7-300/400 project, the password hash is stored within the project file and also written to the MMC. "Unlocking" is typically achieved via .
If a card was corrupted or formatted by Windows, you must write a "good" image of an identical-sized card back onto it using WinHex or similar disk-writing software. For S7-1200/1500 systems, you can use the TIA Portal Online Access to format a card correctly while it is inserted in the CPU. Summary of Tools S7-300 MMC Password Recovery Guide | PDF - Scribd unlock and converter mmc image s7
: Utilities used specifically to read and write S7 MMC images. Note that images created by WinHex may not be compatible with these tools.
If filesystem mounts successfully
Open WinHex and create a disk image (cloning) of the physical card to a Use a specialized utility like Unlock_and_converter_MMC_Image_S7.exe to open the
: Its primary use is to extract the password from an S7-300 MMC when you no longer have access to the original project. into your external USB card reader
An external, high-quality USB multi-card reader (built-in laptop SD slots often fail to read lower-capacity MMCs properly). A byte-level cloning application such as WinHex . Step-by-Step Cloning Process
: Never format the card in Windows when prompted, as this destroys the internal Siemens-specific structure. Unlock_and_converter_MMC_Image_S7 utility and select your saved "Unlocking" is typically achieved via
When you insert a Simatic MMC into a standard third-party USB card reader, Windows will report that the drive is unreadable or unformatted. It will prompt you with a dialog box asking to format the disk.