About "The second time you connect the Kobo to Calibre, Calibre automatically sends the series information, you don't need to do anything or force the update of the metadata of the book". This doesn't happened in my case.
But since my first post I found a workaround using the Calibre's plugin Kobo Utilities. This plugin allows to update the metadata you to choose for one or more books lying in the Kobo without touching the composition of the collections.
Thank you every one.
P.S. I managed my collections through the Kobo Glo.
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