For defenders, this is a success story: a widely exploited flaw was corrected without a formal CVE, simply by a firmware update. For owners, the lesson is clear: – because the days of magically unlocking a Siemens PLC without the password are over.
Use the Siemens manual instructions to create an empty "transfer" card.
(or follow the specific "factory reset" script instructions in the S7-200 SMART System Manual Power off the PLC, insert the card, and power it back on.