My Pioneer AVIC-W8500NEX went from working perfectly to boot looping all of the sudden.

The problem was easily diagnosed as a failed internal SD card, but the problem is all of the guides and files for replacing it apply to the older and lower end 4400NEX. 
 

I have not been able to find the image file for the AVIC-W8500NEX. Can anyone help? This is the boot image for the Pioneer AVIC-W8500NEX that is written onto the internal SD card. Thank you in advance.