At the risk of being the Calibre evangelist in this post... ;-)
Calibre also converts between ebook formats (without the need for the DeDRM plug I mentioned in my comment above if the book is DRM free) and claims to be able to get content onto pretty much any e-reader out there. So I've been able to get Kindle books onto my Kobo e-reader as epubs by running the Kindle-format files through Calibre. (I've never tried with a B&N book). I've found the formatting of the converted epubs to be pretty decent.
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branchandroot
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Date: 2018-07-28 04:03 pm (UTC)Calibre also converts between ebook formats (without the need for the DeDRM plug I mentioned in my comment above if the book is DRM free) and claims to be able to get content onto pretty much any e-reader out there. So I've been able to get Kindle books onto my Kobo e-reader as epubs by running the Kindle-format files through Calibre. (I've never tried with a B&N book). I've found the formatting of the converted epubs to be pretty decent.
https://calibre-ebook.com/