Thanks for providing this image. I just bought a working 4500nex and decided to put in a new SD card from the start. I also own a 4400nex in another car and it had failed, so I was familiar with the process and wanted to be proactive with this new unit. I was surprised to see there was not a reliable image for the 4500nex model like there was for the 4400nex.
Seeing your post, I thought you actually had a copy of the 4500nex firmware, but after extracting your rar file and cloning it on a Windows machine using imageUSB to a new SD card, I installed it and noticed a few things that led me