@Remusrahau if you haven't bought the config or ultimate flat, you will first need to add credits(22EUR) to your account via the money button in the top right corner.
I recommend to connect a charger to your battery.
After connecting your car and waiting for all modules to load click on Security
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Click on Audio
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Click on Remove MOST security
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Click on Execute command
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After the process has finished, shut off the car, lock it and leave it alone for at least 15 minutes.
ITP should be off now.