I was able to flush my PRS-505 by following Valloric's guide. I looked for fonts that supported Polish characters, which I found in this thread
https://www.mobileread.com/forums/sho...ht=polish+font
Unfortunately I'm not having any luck getting the characters to display. I've tried flushing it to unicode, to user-supplied, prior and after changing fonts in all 3 font folders. I've tried overwriting fonts in Sony eBook Library and uploading with Calibre. Calibre shows the rtf document just fine where as eBook library does not, however, when file is uploaded to the Reader using either program I get strange characters.
The fonts that I'm using appear to be able to support Polish characters. Anyone has any suggestions? If it helps I bough my Reader here in States.