This is an image of the internal sd card of a AVH-W4400NEX. You will need to dissemble the unit to access the card. It is android based receiver so will have a android partition layout. If you try to copy it to a fat32 formatted card it will fail.
To write the image to a sd card:
1. download zip and extract the img somewhere
I extracted the image to /tmp/AVIC.img
2. find the device name of your sd card
sudo fdisk -l
Take note of how the SD card is identified.
In my case it is /dev/mmcblk0
3. Write the image to the sd card
dd if=/tmp/AVIC.img of=/dev/mmcblk0