Thanks to all for the good information!
A couple of notes that may help others:
(a) The instructions say to turn on the power while holding the top left button. For those who may be confused by what "top left" means -- it's the Next Page arrow button on the left side of the device.
(b) I was able to flash the firmware update with other files on the card. Perhaps some firmware updates on some devices actually need some blank space on the card to write temporary files? Since I have about 9 gb free on a 16 gb card, I wasn't worried.
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