Got it, Jeff. Thanks!
I should have thought to try the card in a computer--at least to see what's on it. (I did that when my 740 was new, but then forgot what I found.) And you've reminded me that I really should be updating with the card and have a backuip card, instead of bringing the 740 home to update it via wi-fi.
Sorry, I'm not your Don Maxwell, although I do have a "THEDonMaxwell" YouTube account. But for a while I used to get phone calls for another Don Maxwell whom I didn't know when we were both in Korea at the same time.