Here comes the working solution to MPM ECU Tuning Tool can read ECU/TCU but can't write it and asks for credits.
Users cannot save the file after making modifications directly. Only save after reading PCM/ECU/TCU. It avoids credits in this way.
Read data, after the modifications, write the data back, after that, read it again, finally save the data.
Check: MPM Tool How to Write & Save ECU/TCU data without Credits?
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.
https://www.obdii365.com/service/read-write-ecu-with-mpm-tool-without-credits.html
http://blog.obdii365.com/2022/05/08/free-download-and-install-mpm-vcm-suite-4-17-software/
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