I testes Sigil and somehow it worked, but the page numbers are very strange. I've got 2 times every page number, which means I get these page numbers: 1,1,2,2,3,3 and not 1,2,3,4,5,6
And where [1,1] begins on this page is somewhere in the text a '1' and layering the book text. Same for [2,2] and [3,3]. This isn't normal ...
I have a Kobo N514