My 4500 crashed (like all the others) and i was able to get the AVIC software from OP to load on the radio however the touchscreen stopped working but all physical buttons work. never had an issue before, even replaced the ribbon cable incase I messed that up. so now I'm trying to reimage the SD card and/or try Kyle's. I've seen before that once you use an SD card for this it's toast but i was thinking there has to be a way to format it, Linus maybe?