Hey Mark,
I tried this for my AVH4200NEX and I wasn't able to get this method to work on it. I put the files on both a 512MB and 32GB drive formatted to FAT32, tried both USB1 and USB2, and it still sits on the password screen. Any suggestions? The site you posted (https://jenkins.adamoutler.com/job/Customize BSP/2894/) to generate the config files keeps failing and producing nothing. Any suggestions would be appreciated before I have to send it in to Pioneer.