I did the upgrade via SD card with firmware from Pioneer's site. It went thru all the steps and rebooted. I plugged my iPhone 6 into USB 1 and the AVH-4000's screen flashed "attempting to connect to Carplay" then it went back to looking like the old version except Aha was added to source list. Under setup, I have selected USB1 for smartphone. All other devices were disconnected. Where is CarPlay? I am doing something wrong?

i got this initially as well. all i did was shut down and restart the iphone and voila!

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I should  have tried that as well. It works great now and no pop when shutting down. I'm a happy camper!