Have you checked your epub with calibre's ebook-editor Check book tool? Have you installed the epubcheck plugin to see what errors it comes up with? Does the calibre viewer on your computer open the epub? Or ADE, Thorium, etc. on your computer?
And I'm not sure that I would call a device that was discontinued in 2020 a 'new' device. I'm going to assume that you are using dslibris 1.5.2-2?
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