You haven't mentioned the make and model number of your HU.
Search for the thread on installers in Bangalore. You will have to do the rounds and ask around, maybe they have a faulty unit left-over.
Ditto for the dealers & shops on JC Road Mission / Lalbagh Road. They sometimes have faulty units returned (with no recourse to official repairs, that's the bane of grey sales).
If you had bought it with b&w, maybe the original manufacturer can get you a replacement piece.
Cheers and happy hunting!
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