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Copy the problematical file from Calibre's library to somewhere else.
Leave the original folder and file where it is.
Fix up the copy with Sigil, but change the name of the book slightly - for instance put a random character at the end.
Re-import it back into Calibre. Calibre will think it's a different book and create a new folder in the library.
Delete the original problematical book from within Calibre, and delete it from your reader.
Correct the name of the new book by editing its metadata, then export it to your reader.
Job done.
Read!!
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