A6 Quattro Wagon V6-3.0L (AVK) (2002)
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Select "Press here to display input keys".
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Enter VIN using input keys, then press "Q" button to confirm.
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Select forward arrow > on navigation bar.
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Select "Press here to display input keys".
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Enter Radio serial number using input keys, then press "Q" button to confirm.
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Select forward arrow > on navigation bar.