PDF to EPUB works in Calibre not on PRS-350
I've read that PDF is properly the worst format to convert but as it is my only source for 3 books I had to try anyway. The strange thing though is that the resulting EPUB's are working fine in Calibre. They are shown with cover, are opening (even though it takes some time) and the pages are perfectly readable in the viewer. However, when transferred to my Sony PRS-350 the cover isn't visible and when trying to open the book one get's a page opening error.
Is there any way to resolve this issue?