Thanks for the suggestion. I have been running with the battery out and the usb cable in as suggestion in the forums. By doing this I am certain to have enough power.
But THE GOOD NEWS:
The problem is solved. I switch to a different SD card. And now the update works. And here is the surprise - the bad SD card (which operates fine otherwise) was a SanDisk card.
So, if you are having problems with update - and you have tried everything else - try another SD card.
Followup question: is there any software that verifies the integrity of an SD card?
Thanks to all who listened, read, and especially, responded.
G
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