How To Find Your Audi Symphony Serial
There are 2 types of serial numbers for Audi Symphony radios, standard, and NavigationPlus (for Navigation Plus see method 2). It is quite simple to remove your Audi Symphony radio. You will need a set of radio release keys. These are inexpensive tools, you can obtain them from Amazon.
Once you have the radio release keys, push them into the 4 holes in each corner of the radio (See image), apply a little pressure and the radio will release from the dashboard. The radios label will be located on the radio's casing.