FethryDuck - thanks for the reply. The screensavers weren't working, but, relieved that I could reset the device if necessary, I tried again. This time I saved my pictures as .png instead of .jpg, and the update worked. I have no idea whether I was just unlucky the first time, or whether the change in file format had an effect, but I'm happy to say I no longer have grumpy authors looking at me when the screensaver kicks in. :-)
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