Calibre has just added support for the Kindle Paperwhite 4 - Good e-Reader
Amazon.com: HOW TO SIDELOAD AND DELETE BOOKS ON YOUR KINDLE DEVICE: A Simple Step by Step Guide with Pictures Updated for 2019 for Kindle Paperwhite, Fire HD, Oasis ... Kindle Devices (KINDLE
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Calibre 5.31 Ebook Manager Adds Support the New Kindle Paperwhite 2021 - 9to5Linux