I have had IPhones since their inception. Last phone was the 5. A few months ago, I upgraded to the 6 Plus. Here is my issue. On my 5, my car radio (which has USB port) allowed me to plug in and listen to radio or music from my phone and the bonus

Question

I have had IPhones since their inception.  Last phone was the 5.  A few months ago, I upgraded to the 6 Plus.
Here is my issue.
On my 5, my car radio (which has USB port) allowed me to plug in and listen to radio or music from my phone and the bonus was it charged the phone as well. All worked great.
Now with the 6 Plus, neither of things work.  The message on the radio (Kenwood) says I Pod error.  The message on my phone say's "this device is supported".
I have called on this before and was told you are aware and that the issue will be addressed in a future update.  There have been several updates on IOS 8 and the issue remains.

Answer 1

I have a Kenwood KDC-X695. When I purchased this stereo and had it installed, I had an ATT iPhone 4.
It worked with the stereo, but had a few issues. I had purchased a few audio books that I would listen to while driving. When I plugged it in it would immediately begin to play the book from the beginning or if I had been listening to music, it would start playing the song that was at the top of the song list.
The stereo came equipped with Firmware version 3.05. I upgraded to the iPhone 5 a year later. I had that phone for approximately 2 years. The song or book issue remained the same.
I just recently upgraded to the iPhone 6 and the Bluetooth function still works, however the USB port on the stereo that the phone plugs into to allow files on the phone to play through the stereo no longer works.
I contacted the service provider (Verizon) and after speaking to several different technical support technicians, they provided me the phone numbers for Kenwood and Apple because they were unable to help me.
I spoke with Kenwood technical support the following day and after a few fumbling miscues from the technical advisor, it was suggested that I upgrade the firmware, even though the Kenwood literature warns against this if the Bluetooth portion is working, because if there is a problem with the upgrade, it can render the Bluetooth useless and non-functional. The advisor did suggest the latest firmware on the second or third attempt, after I pointed out what I was able to glean from my initial search.
Later that day, I went back to the Kenwood site (from their homepage) and by using their selection tools, discovered that this particular model was only ever intended to be used with the iPhone 4S (the technical advisor was not aware of this, even though I mentioned this during my phone call earlier in the day). According to the Firmware selection tool, my iPhone 5 should not have worked with it.
I performed the Firmware upgrade, and it took 13 minutes. This was less than the 15 minutes that was forecast in the Kenwood literature. The Bluetooth still works but the USB cable connection still causes the unsupported device message that I received prior to the upgrade. I am incredibly annoyed and disappointed.
By upgrading to the iPhone 6, I have three choices; (1) only use the Bluetooth for phone calls without the ability to play other files from my iPhone 6 (2) forced obsolescence of my stereo, requires buying a new stereo (3) return my iPhone 6 and go back to my iPhone 5.
I do not believe that I should have to be a software/Firmware/hardware engineer, vetting every single device that I own; prior to upgrading a cell phone.
I am incredibly annoyed with Apple at the moment.
I have a separate Bluetooth headset that worked with both my iPhone 4 and iPhone 5 that the iPhone 6 simply does not recognize. That is another story for another time.
Currently, I am incredibly underwhelmed with Apple.