And the same thing for PRS-300:
http://tmp.pepak.net/hack-epubfonts-...ebug_only!.zip
Extracted from russian firmware as well:
http://translate.googleusercontent.c...8lxEcMQeyc861g
Same cautionary note applies:
I don't have a PRS-300 so I can't test the hack. It may not work at all, it may brick your reader, anything. Not recommended for anyone who doesn't have a lot of experience with flashing his reader.