A fixed unlock means:

Once the LEDs stabilize, remove the card and restart. The password is now removed. Can You Recover the Program?

The S7-200 SMART was notorious for its security. It wasn't just a simple lock; the project was protected by a multi-level password system that encrypted the block access. If they tried to brute-force it, they risked wiping the entire program—a disaster that would require rewriting months of logic from scratch.