Some of the advanced features of an android Headunit are protected by a PIN Number. There reasoning behind this is to prevent the tinkerer from changing setting that could cause a problem. The problem? The PIN codes are in the manual and you have either thrown it in the recycling by now or there is no pin code in the manual. The PIN codes protect settings, but also protect the factory settings for a reset. The two PINs can be different numbers, so you may even be searching for two PIN codes.
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