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Old 03-02-2020, 03:32 AM   #2
yonkyunior
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Posts: 94
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Join Date: Feb 2015
Device: PRST2
the metadata changes in calibre was not final until we "save to disk", or convert the file, and any action to send file to another device.
and if calibre database corrupt, then calibre search the opf file first (not sure), then restore the db, since the opf in folder was update than opf inside the epub.

if you open epub file (extract),or open with epub editor, you will see built-in opf file,
you can compare the opf file if you want.
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