The default config shouldn't touch the condensed setting (ie. it'll always use Caecilia Condensed), while the nocondensed trigger file will make the condensed setting use the classic Caecilia.
That's what I thought too, but after restart the all font went regular...
It seems to work as designed on my end, so I'm not sure I really get the issue you're referring to... . What do you mean by 'after restart'? I'm assuming you never tweaked the reader.pref (or whatever) config file in the system folder?
"After restart" means when I go to Settings -> Restart to do a full restart...It seems the autoreboot triggers a different kind of "restart". Is that so?
One thing I'm pretty sure about is that the 'pdf', 'new', 'keep' & co stuff will always use the regular font, but I never checked that fact .
They are really condensed (or at least different from regular)...I have seen those characters having different spacing.
Although, if you only want to tweak the CJK font, you may be better off using a slightly tweaked font.properties file (with only the CJK stuff modified).
That is what I did. I have just tried using a reboot file instead of Menu -> Setting -> Restart. Now it seems fine...
I'm not sure what causes the problem but considering the fact that other than applying updates I will never need to full restart my Kindle, I will live with it. Thanks for so much help!