What kind of scenario are you working on—
: Extracting the password hash and "pushing" it back to the PLC to gain access. Offline Brute-Force unlock s7-300 plc password
Some third-party tools and services claim to offer password recovery or unlocking features for S7-300 PLCs: What kind of scenario are you working on—
The STEP 7 software is a development environment for S7-300 PLCs. unlock s7-300 plc password