No. You need to have a unique ID set in the header. You can do this in calibre. ... | Hacker News

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2mur on Oct 23, 2012 | parent | context | favorite | on: How To Strip DRM from Kindle E-Books and Others

No.

You need to have a unique ID set in the header. You can do this in calibre.

Specifically, a unique 4 byte character sequence at the 32 byte offset in the header (MOBI header). See: http://wiki.mobileread.com/wiki/MOBI

If that's set (easy in calibre), you will sync across your devices.

extesy on Oct 24, 2012 [–]

Can you provide more details? Assuming I have some random AZW3 book and calibre - how to correctly upload it back to Kindle and not lose that unique ID along the way?

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