Quote:
Originally Posted by Sirtel
If you only change the metadata, not the files themselves, there will be no need to delete and resend the books. Calibre will update the metadata on the device automatically (the metadata management must be set to automatic in the settings).
Deleting and resending books is necessary only when you have edited the files themselves (for example, in Sigil or the Calibre editor).
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It depends on what sort of changes are made. Most changes do not need to have the existing copy removed before sending the new copy. I believe even a ToC change can be dealt with by a ToC update (I'd have to double check that).
So to clarify, it's not necessary to remove the existing copy before sending the new copy even if you've edited the code. I've done this a number of times with no ill effect.