DZO - you are amazing! - thanks to you my C9P6 (AVIC 0457zm) is now in English.
I have another question, that I'm hoping someone can help me with. I got the stereo from a friend (was factory fitted to his Mazda Atenza) and it works great (better now in english) apart from the Bluetooth function which seems flaky.
I can pair my phone ok but when I try to connect when I start the car and tuen on the radio, most of the time I can't get it connected and just get the message "you cannot currently connect"
image here (sorry wouldn't upload) https://share.icloud.com/photos/0aYp9_Z7hm