Thanks a million to @flyboy320! And on top of everything, now instead of a 2GB SD card in the Kobo, I have a 16GB card installed. Wonder how many thousand books that'll take? <grin>
I followed the procedure and it really works. Just as a precaution, after opening the case and exchanging SD cards, I waited to put the case back on until the Kobo was reset and re-registered.
After resynching the device to the Kobo Desktop application, there was a white-knuckle moment when it again displayed that notice about upgrading the e-reader's software, but everything seems to have come out fine this time. Whew!
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