I did a version 0.0.12 where I fixed a bug with setting titles and authors that was shorter than the original ones.
I got an exemple MobiPocket version 4 file where the cover image was not the first one and I have not figured out how this image is pointed out so for these kind of files replacing the cover image will not work. In the MOBI header I think the data in B0-CF are related to this since they seem to contain pointers to records. B0 seem to point to the record with a small thumbnail image but changing just that image will not change the library image on my Cybook.
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