I tried this horrible software on my 300. Epubs look like crap. There are strange characters displayed and formatting looks like a damn text file. each paragraph begins and ends with a box looking character. Links don't work. And the file manager cannot find pre-installed books. I installed both a DRMed ePub file from Sony Store and a non-DRMed one in one of the apps folders so it could find them. The fb2 files look just as crappy. Also, it takes minutes to open a book and the menu interface is super slow. The jump to page function is retarded. The Sony firmware is much faster, displays much better, is more user friendly. I would not waste time installing this crap.