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I'd be wondering how much a head unit controls. Is it "just" a radio, does it have the CEC, GPS, any other brains for the car?
If it's just a stereo, might be time for an aftermarket option. If it controls a bunch of stuff I'd start thinking something used from a junk yard.
There may be coding of some sort involved, setting it up specifically for your car.
Not fun. Good luck!
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