I got this error when trying to import by hand:
calibredb add B000FC1KBG_EBOK.azw
MOBI header version = 4, length = 228
The kindle.info files has not been found.
Crypto Type is: 2
I'm using version 3.8a
It worked before when I import the drm ebook from my
Kindle. But after install
Kindle for PC, all the books from both my PC and Kindle can't import.