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Sounds like you have the base head unit. To get navigation on the built in screen you have to have the upgraded head unit (option)OR put a aftermarket one in yourself.
But consider this...I have the base head unit as well and can get AUDIO (not visual, on screen turn by turn) navigation when i use the Bluetooth streaming and use my smartphone's navigation. It's a good compromise if you don't want to buy a aftermarket unit.
As far as "upgrading" your BASE unit to get turn by turn navigation on the screen... I don't think that's possible and sounds like u were misled by the salesman.
Sent from my HTC One_M8 using Tapatalk
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