How to Flash Your MQB 2.0T


  • Ensure your car is parked in a safe and secure location.
  • Confirm that the car battery is in good condition. If there's any doubt, fully charge the battery before proceeding.


    Connect SL1 Dongle:

    • Locate the OBD2 port in your car. This is usually found under the dashboard, near the steering column.
    • Plug in the SL1 dongle securely into the OBD2 port.


    File Download:

    • On your Android device, access the email or message from our tuners containing the software file.
    • Download the file onto your Android device. Make sure the download is complete and the file is saved in an easily accessible location.


    Android Device and Car Battery Precautions:

    • Connect your Android device to a charger, or ensure it is fully charged (100% battery).
    • Hook up your car to a battery tender. This is crucial as the flashing process takes 20-30 minutes and can drain the car's battery.


    Initiate Flashing Process:

    • Open the 'SimosTool' app on your Android device.
    • In the app, select the 'Flash' option.
    • If this is the first time you are flashing this car, choose the 'Unlock Vehicle' option. This step is essential for first-time flashing.


    Follow App Instructions:

    • Carefully read and follow the instructions provided in the SimosTool app. Each step must be completed as directed.
    • Do not interrupt the process or disconnect any cables once the flashing has begun.



    • Once the app indicates that the flashing process is complete, the car's ECU should now be successfully flashed with the new software.


    Post-Flashing Steps:

    • Remove the battery tender from the car.
    • Start the car to ensure everything is functioning correctly.



    • If you encounter any issues, refer to the troubleshooting section in the SimosTool app or contact our support team for assistance.