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Z120BT firmware upgrade for dummies

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My car has an original firmware Z120BT to which an old iPhone was paired and working. I upgraded to a newer phone and am trying to pair again as per the Z120's quick start guide but it's just not happening. The phone sees the PIONEER-NAVI as something to pair to, but when I try it fails. The Z120 will eventually say registration failed and Bluetooth is then off until I restart the car.

Assuming it's just crappy decade old firmware I looked through the updates on the Pioneer USA site and the most recent I can find for the Z120BT is 2.003 which doesn't appear to be any newer.

What are my options for getting newer firmware that may improve the Bluetooth support besides buying a new stereo and where do I obtain them?

Any help gratefully received!

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