Yes, BUT you need a BT CAN service key to do it.
Truck OFF, connect BT CAN key.
Press & hold a horn button
Turn truck ON
Look at the display & release the horn button when P is shown
Use the throttle butterfly to scroll to parameter 25
Press the horn button, display will flash.
Use the throttle butterfly again to scroll to 0
Press the horn button again to save the value
Turn the truck OFF & remove the CAN key.
Job done
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