I have got some other problems. I created a new image (not uploaded yet) to fix the missing camera resolution. This worked, so there is no need to manually copy this file anymore.
However instead of the lock screen, the phone displays a blank screen with the circle is rotating. (It is seemingly waiting for something to finish.)
I waited then tried to swipe and I got to the desktop. Hmm. Then I relised there was no icon for the cell network at all. Hmm again. I went into the settings and the Messages app was dimmed and not available to click on. Finally I realized the 'ril_subscription.conf' file in '/etc/ofono' was missing. I copied in and that solved this issue. (Although the mobile internet still doesn't work.)
I don't really understand why this file disappeared from the build but I added into the droid_config/etc/ofono/ folder and generated a new build.
The file was missing again and I got the same symptom. (No network icon, spinning circle instead of lock screen.)

The other issue: The contact import wizard is broken. (I got a 'Could not load page' error when I tried to import my contact with it.)
However the import 'From contact file' option works fine.