Converted PDF

Hi,

This has been mentioned in an old thread with no solution.
I would like to read books from http://mendele.co.il/ on my kobo touch (ebooks in hebrew).

It seems as if the kobo touch does not support hebrew, so i converted the epub to PDF.
The book works fine and i started reading it, good book, however from page 20 to page 50 it was showing blank pages . is there a solution to this problem?
same thing happens with a diffrent ebook.

If i read the PDF on my PC ot works fine.

This makes my kobo useless as i was hoping to read hebrew books on it.

thanks,
Bar1