Quote:
Upgrading the book’s internals
This tool can be used to upgrade the book’s internals, if possible. For instance it will upgrade EPUB 2 books to EPUB 3 books. The tool can be accessed via Upgrade book internals.
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Just curious but when would I need to do this?
Most of the time, I need to take epub3 tags, etc. out of a book to make it a little 'cleaner' so I can reformat for easier reading on my Kindle