Bought the Rio Nitrus after reviewing them and seeing there were great reviews along with the bad ones. I guess you could add us to the list of the dreaded upgrader message. Downloaded a couple of books and songs and then wanted to test it with a fm transmitter and it wouldn't turn on. Just clicked away and got hot. Hate to tell the guy who said just use the reset button... must have tried that 10 times. Finally have given up and returning it. starting the search again!!!