Very difficult to find for free. This ECU uses a rolling checksum algorithm. Most free downloads for this plugin are fakes. You likely need to purchase this from a professional tuning server.
What (hardware) are you using to read and write the files? winols checksum plugin download
: If the numbers do not match, the ECU assumes the data is corrupted or tampered with. It will lock itself to protect the engine. Very difficult to find for free
As for the WinOLS checksum plugin, it remained a trusted tool in John's arsenal, helping him to deliver high-performance tuning solutions while ensuring the reliability and safety of the vehicles he worked on. winols checksum plugin download