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You have to have 3rd party SW *SOMEWHERE* to update a file on any device (rather than simply remove it) unless you are going to manually type it in (which isn't possible on any ereader).
Calibre seems to be the best software to manage ebooks from diverse sources including our own ebook creation. Better than using a file manager over USB (which is 3rd party software) and far better than WiFi to a server (which is 3rd party software), especially one owned by a corporation (the Cloud, Amazon, Google, Kobo libraries, dropbox etc are all opaque 3rd party software on someone else's server).
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