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Fixing Pioneer AVH-W4400NEX flaky screen
Problem: Headunit screen would glitch out like a cable was loose. Eventually died completely where it would enter a boot loop showing âPioneering loadingâŚâ head to the âsplash screenâ and then glitch and repeat or goto a black screen with the bottom blue buttons illuminated.
Solution: After researching this problem, it was not due to a loose cable but rather poor storage medium and becoming corrupted. The solution is to replace the SD card the firmware is stored on.
- Order a high speed or ultra high speed SD card. I chose this one: https://www.amazon.com/dp/B07H9J1YXN. You need at least 16GB. I recommend not using a random SD card you might have and trying to find one with good read/write speeds. I used an older SD card first and it worked but performance was crappy. Replacing with a high speed card resolved this issue
- Download the firmware, an image does not appear to be directly available from pioneer. There is a forum that stores the file AVIC-4400NEX-1.02-IMAGE.zip here which I used, or alternative check the thread here
- Flash the image to the SD card, on macOS I used balenaetcher
- Remove the head unit from your dash. Itâs a good practice to take a picture of what cables are connected to the back of the unit before disconnecting anything.
- Take off the removable display from the head unit.
- Pull out the slide mechanism. This is shown in the above video at 2:45 to 3:43
- Disconnect the ribbon cable from the back of the slide mechanism. Watch from 10:08 to 10:55
- Remove the black plastic trim. Watch from 3:43 to 4:27
- Swap the SD card
- Reassemble