Thanks Frenzie.
Not sure if it happens only to me, but everytime I update to another nightly version, the dictionary gets broken - the words are not found anymore.
So what I do, Akbar has provided a solution - replacing sdcv file. Is there anyway to implement this new sdcv file for nightly versions? or is is just me having this issue.
Yes, the easiest way is to use the sdcv file below to replace the one inside koreader folder:
https://github.com/koreader/koreader...x-gnuabihf.zip