Janet,
Thanks for replying. But the instructions that you sent me are exactly what I've been trying, and it doesn't work. Perhaps I was not clear enough when I said "I've gone through the hold-the-button-down while plugging in the USB cable a dozen times. It doesn't work." The instructions you send are exactly what I meant, and to be clear, they do not work for me.
One thing is a little different today. Last week I could get to step 7 in the instructions, click on Update Firmware, but then I'd get an error and the process would stop. Today when I get to step 6, hold down the button and reconnect the USB cable, nothing at all happens.
Gary