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There is no reason to upload a "mobi" so-called to the KDP platform. Since January 2012 I have uploaded every book as a validated epub built by Sigil. If one refrains from including a cover image, no problem has ever arisen.
The vast majority of my images are 800 pixels wide, and I include a width="100%" instruction in the html. There is no problem with the older Kindle devices because their ruling motto is to enlarge all images to full width anyhow.
Can you not persuade your client/friend/whatever to upload an epub? Tell him/her/it that all the best people are doing it!
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