There is a bug that lets you use the aux cable. Just insert a USB into the usb slot near the cup holder that has song(s) on it as mp3 and nothing else, not in a folder either.
Plug the aux cable into the radio and have the USB with songs on in the slot, then turn the car on.
You should then be able to use the aux cable to play whatever you want.
Keep in mind, the display will show the songs on the usb not what you’re playing on your phone.
You can make multiple blank hours long mp3 files to keep the music playing and call it ‘AUX’ so that that pops up on the radio screen (so it looks like it has an aux mode).
Doing this will remove the blue and me functions though, rendering making/receiving calls not possible as you cannot hear anything through the speakers as your phone is connected. Whether tapping in the aux cable to the blue and me aux cables works, I do not know.