To follow up on my post above from a couple of years ago. No-Nav 8.4 uConnect5 version 00.246.71.04.00 that came from the factory was, to put it mildly, weird. After the free Sirus XM ran out I switched to a USB key and the fun started. About 80% of the time, upon restart, the radio wouldnt remember the last song playing and start there, instead it would reset to the first mp3 in the first folder on the USB key (alphabetical). I got pretty sick of listening to that song. No amount of variations would change it, NTFS, FAT32 format, old key, new key, small key, large, playlists, no folders or just playing out of a album folder. Oddly enough every few days it would suddenly get its memory back and for a few restarts, it would work as it should, picking up where it left off. But it would eventually fall back to amnesia mode again.
Another odd thing was the radio refused to connect to any WiFi access points. I tried a couple of different ones at home, tried the library, a hotel, etc. Never could get it to connect. It would see the AP, but after typing in the password it would think about it for a minute then fail to connect.
Without the ability to connect to WiFi, I would never get an update for the radio. Kinda a catch 22.
Last week, I took the truck in for the clockspring recall. I had them look at the radio also, the service manager tried the dealership WiFi and it wouldnt connect there either.
When I got it back the radio was updated to Build Number 00.255.45.06.00 to "fix the wifi issue". Drove it all week and the radio seems to remember the last song played so that is probably fixed as well. It is also connecting to the home WiFi now, so I should get new updates if any more are released.