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This is a great tip to replace main_thumbnail.jpg with the cover image that you want. Is there a limitation on the image size? Just curious.
On my first attempt at this trick, some of my thumbnails ended up as blank. I found another post where someone suggested to use 217 pixels as the maximum height, probably because the thumbnails auto-generated by Sony are 168 X 217 @ 72 DPI. However, some of my image files are roughly 300 X 500, and those thumbnails display ok on my ereader. The ones that I tried that were blank were over 100kb in size.
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