After many hours over the past weekend I can now refine an explanation of the problem, but the solution is beyond me.
Excluding the pre-loaded books and books downloaded from Borders, non-DRM ePub books that were loaded and readable with the old 1.4.* firmware no longer appear in the Kobo library. Using Windows file explorer I can see the directories and ePub files under the Kobo root directory.
I have been able to work around this by redownloading and installing the 1.8.3 update (eight times so far) and then opening and starting to read each of my ePub books in turn. (If they are not opened and read they do not show in the Kobo library when next I start it up.) It is a very tedious method of getting non-DRM ePubs onto the Kobo. The method used to place the books on the Kobo makes no difference, whether ADE, Calibre, or drag and drop from Windows.
The Kobo SQLITE file, Kepub and images files have been overwritten with a download from links on this website.
No doubt there is a cause for this problem but I am beyond caring what it is, I just want it fixed, even if it means erasing the entire mini SD card and overwriting it with a complete new set of files. Can this be done through Borders? Is it possible that there is a hardware problem?
BTW, no response from the Kobo desk yet.
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