as an update, and in case this may be useful for others: I did copy the whole of the Mini on my laptop before connecting to Calibre again, and I can confirm that, when things go wrong, if you then erase everything from the device (my laptop is set to show hidden files too) and copy back the backup, you restore the device to the pre-mess condition. At least, it did work for me on the Mini running firmware 2.4.0
However, still cannot get the bleeding book on my Mini!
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