Hello,
I finally found a solution.
Using calibre, you just need to resize the cover image in 1200 x 1800 px.
After that, I convert to mobi without other modifiction in calibre, and just send book to kindle.
I allready read that solution in another post, but I did not tried it at first, it seems not logical, why should it work?
But in the end, after I have tried anything else, I tried it and it works.
I'm now able to show mobi cover and use Whispersync.
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