If a password is lost, there is no native "password recovery" tool that reveals the original text. Siemens explicitly designs the hardware to prevent password retrieval to maintain industrial security. The only legitimate way to regain control of the hardware is to wipe the device and restore a backup. Method A: Factory Reset via Siemens Memory Card (SMC)

Siemens offers a for blocks instead of full CPU lock. This lets you upload the program but not see inside certain FBs. Consider this less restrictive alternative.

What is the of your S7-1200 CPU (e.g., V3.0, V4.2)?