YOLAN: Maybe I can help (though I'm just referring to knowledge from others):
If I understand you right you want to mound other system-fonts.
I wanted the same: mound other system-fonts on my 350.
But mounding single fonts didn't work at all as man can read here:
https://www.mobileread.com/forums/sho...d.php?t=155059
Solution:
Copy all 4 (!) fonts in a folder and
mound the
folder, like:
mount --bind /Data/fonts /opt/sony/ebook/FONT
Fonts in Root/fonts/
Works great. Problem was to get the 4th font which is quite large (~10MB) for the dic.
A.
Edit:
YOLAN: In your first post you mentioned corrupt (CSS)-files. I have had some corrupt files too. Reason was simple a corrupt memory (which is easy to correct with reformatting the memory of the reader as you did).
The other problem is (you are not alone) the CSS-file sometimes doesn't work. I solved this issue in two ways:
1) produce the 'ultimate' CSS-file (work in progress)
2) substitute system fonts
That leads in having Caecilia as system fonts and additionally Caecilia mentioned in a CSS-file.