While trying to convert EPUB to AZW3 I noticed that with KindleGen it no longer displays covers on the home screen but it does with Calibre.
Personally I don't really want Calibre in my toolchain so I tried to do it the hard way.
Soon after that, I found that the thumbnails are saved on /mnt/us/system/thumbnails with the format thumbnail_<ASIN>_EBOK_portrait.jpg, and Calibre sideloads the thumbnail there with the appropriate ASIN number, so I tried that with the KindleGen books but without success (Searching the ASIN number with KindleUnpack on the compiled book).
It seems like the problem is that I'm getting the KindleGen books with the "personal" tag, and it somehow ignores the thumbnails (however I don't see that problem with mobi files).
I tried with the full KindleGen output, the kf8-only that I extracted, and also a repacked kf8->epub->kf8 but all of them had the personal tag and ignored the thumbnails.
Supposing that actually the "personal" tag is the problem, is there a way to edit the header or whatever it is on an uncompressed KindleGen output to modify that?
Personally I don't really want Calibre in my toolchain so I tried to do it the hard way.
Soon after that, I found that the thumbnails are saved on /mnt/us/system/thumbnails with the format thumbnail_<ASIN>_EBOK_portrait.jpg, and Calibre sideloads the thumbnail there with the appropriate ASIN number, so I tried that with the KindleGen books but without success (Searching the ASIN number with KindleUnpack on the compiled book).
It seems like the problem is that I'm getting the KindleGen books with the "personal" tag, and it somehow ignores the thumbnails (however I don't see that problem with mobi files).
I tried with the full KindleGen output, the kf8-only that I extracted, and also a repacked kf8->epub->kf8 but all of them had the personal tag and ignored the thumbnails.
Supposing that actually the "personal" tag is the problem, is there a way to edit the header or whatever it is on an uncompressed KindleGen output to modify that?