[LuucyyQueen]

My Kobo Touch Ereader was working fine but after powering it off one night and turning it on the next morning I now cannot open certain kepubs, even ones I have read and finished or were reading at the time. I get an error message saying:
''Oops! This document couldn't be opened: There might be a problem with the file. Try updating your library.''

I have updated my library and still cannot open the kepub books (they are all free ebooks by the way)

I cannot read them on the kobo desktop either, it comes up with this error message:
''Content locked: we are unable to display the selected content. it may be locked or corrupt''

I tried removing and re-downloading the books that wont open but that hasn't worked.

I have heard about doing a factory reset but will only do this as a last resort, has anyone else got/had this problem?

Any solutions?