even if prompted. Use WinHex to create a disk image of the card. Read Password

The MMC card used by S7-300 is a standard multimedia card in a Siemens proprietary format. If you physically remove the MMC card (located behind the front door of the CPU), you can read it using a standard USB MMC card reader and low-level disk editing software.

The password wasn’t random. It was a deterministic function of the wrong date.

Specialized third-party tools, such as Unlock_and_converter_MMC_Image_S7.exe , can scan these cloned images to locate the stored password.