Question: I can read ecu with the mpm ecu tuning tool but can’t write it asked for credits.
Answer: You cannot save the file after making modifications directly. Only save after reading PCM/ECU/TCU. It does not ask for credit in this way.
MPM Tool How to Write ECU/TCU without Credit?
Step 1: Read ECU/TCU data and save
Step 2: Make modification
Step 3: Write the data back after making modification
Step 4: Exit VCM Editor
Step 5: Read again and save data.