) typically refers to a process used by engineers to recover forgotten passwords from Siemens S7-300 PLC Micro Memory Cards (MMC). Password Recovery Process
A used S7-300 CPU (e.g., 315-2DP) costs €200–400 on eBay. Replacing the CPU and reloading a backup program (if available) is often faster than weeks of hacking.
: Release the switch and immediately return it to the MRES position within 3 seconds. Completion
There are a few methods to unlock your S7300: