When a PLC program is password-protected and the source project is lost, the "Unlock" procedure typically involves extracting the password directly from the MMC's binary data. Extraction Method : Using a hex editor such as Insert the MMC into a PC's card reader (do format if Windows prompts you).
Never attempt to format a Siemens card in Windows unless you already have a backup image ready to flash back. g., 64KB or 512KB) to perform a recovery? MMC card for Simatic S7-300
Modifying fstab without re-signing the image will trigger dm-verity on locked bootloaders. You must also patch vbmeta.img .