Head Unit will not play music from iPhone?

My head unit will not play music from the usb port, but it will from the aux port, can someone please help me solve this problem?

The latter three display an error code when the iPhone is connected with the phones supplied Lightning cable, preventing audio from streaming over the cable into the head units, he said.

The used may just be for power and not playing music.

Most factory stereos or old radios don't support IOS5 or IOS6 from apple
to make your iPhone work you have to downgrade your iPhone or upgrade the radio iPod software

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