Move epub to ibooks

[Cikaba]

Hello,

I copied the contents of my ibooks to my computer using Ifunbox, prior to resetting my Ipad mini to factory settings. I was click-jacked by a criminal demanding £100. So, my question is how do I put back the cotents of the ibooks folders to the Ipad? The epub books from ibooks that I copied to my computer are all contained in folders that end in .epub. Every book has a folder.

Thanks.