The bonnet is released from inside the Audi A4.
The wiper arms should be resting on the windscreen: make sure they are not in a raised position. Otherwise the paint may get damaged.
With the driver's door open, pull the lever under the dashboard in the direction indicated (arrow) Fig. 1.
Lift the bonnet slightly WARNING!.
Press the release catch under the bonnet upwards Fig. 2. This will release the arrester hook.
Open the bonnet.