I installed the new firmware last night. I was delighted with the sound!
Does anyone else use a Mac, who downloaded the firmware? I'm getting all the music files listed a second time, with ._ before the second file. (It's similar to when I take a flash drive to work, and view the files on my Windows machine there.) Unfortunately the X3 tries to read those files. (I have folders as playlists, so I listen in "Browse Files" mode.) It usually will quickly skip thru the file, with an error message, and go to the next file, which is valid. But it started shutting down after each song, so I switched back to the old firmware. There's also the "Trashes" folder, which I also see when I'm looking at my flash drive from a Windows machine.
I forgot about the Sleep/Idle being switched around, and I'd changed Sleep to 0, so hopefully that's why it started shutting down each time, while it tried to read the invalid files. I'll try the new firmware again, when I'm more interested in problem solving, rather than listening.
But if anyone knows how to deal with the ._ duplicate file names, let me know.