I can confirm that the file posted for the AVH-W4400NEX works. I reformatted a SD card and made a simple file formatted to ext4. Then I used win32 to write the image to the card, plugged it in my machine and it booted up first time. Thanks for posting this. Saved me from having to buy from Pioneer or ebay. They really need to put better SD cards in their devices as this seems to be a common problem. I have another unit in a different car so I made another card to have on hand for when it goes bad.
