The “exclusive” unlock tool was later analyzed by Siemens’ ProductCERT. It exploited a bootloader vulnerability in S7-300 firmware versions prior to 3.2.2 — a flaw patched in 2016, but still present in legacy systems. The tool’s rainbow table only worked on weak passwords (dictionary words + year). Strong passwords (e.g., "&2kL9#pQ$vR7") remained uncracked.
If you don't need the current program, you can factory reset the CPU to remove the password. siemens s7 300 password unlock exclusive