After ISO update Amazon Music is flat and has no tone on CarPlay. How can this be fixed? I've updated all firmware on head unit, EQ setting on phone, removed and installed the Amazon app on the phone. It sound fine when ran through Bluetooth.

Thanks for the help, I found another thread that others are having the same problem on multiple units, factory installed and aftermarket, that have gone wonkey after the ISO update. Looks like its a bigger problem across a different units. Its got to be a compatibility issue in CarPlay its self.

Yep, tried custom EQ and preset settings with no change, just flat music. Almost like its in ATT mode but only when lighting cable is plugged in.