Hello, I used PRS+ and successfully flashed my PRS505. I opened a Vietnamese epub, but only some of the characters are displayed. After some digging, I realized that PRS+ only support Latin 1, but to read full Vietnamese, I need "Basic Latin, Latin-1 Supplement, Latin Extended-A, Latin Extended-B, and Latin Extended Additional segments" (from Wikipedia).
I followed the wiki on
How To Custom Fonts, creating my own font per the *VERY* detailed guide (I've had some practice with this from trying to use PRSCustomizer before). Then I put the fonts in the "fonts" folder and finally load the script to mount the fonts. I also changed my PRS+ Settings to FontsAsInLRF. After opening my epub, some more of the characters are displayed, but still not all!
At this point, I think I have a font problem but can't think of anything else to do. The strangest thing is that after I followed the wiki, I get some more characters!
I'm still very impressed with PRS+ though. Is there a donate button somewhere?