gtrman33-
So I got my 4000 working again, downloaded a restore image for a 6100 and did a restore onto a 8GB standard SD card. Booted right up as if new, it even had my phone in bluetooth memory and connected! Firmware reports 1.05. So far haven't tried all the options, but HD RADIO and BT are working. I tried a quick firmware update but that has always been a challenge with these devices and it says my firmware upgrade USB stick is not set up properly.
I can't remember where I got the image, but it was off the site here. Filename AVICimg6100.zip if you want to look around. I bel