you should follow instruction step-by-step. flashing kernel before unpacking.
I reflashed today with Win_OCF_02-6_RM680-RM680-OEM1.exe the flasher you provided in tutorial, a clean install(I needed that).
After that, I unpacked the nitdroid and failed to unpack the boot.
Also I have followed several topics, but I still can't manage to get it working.
EDIT: Ok, it seems I just runned the oneclickflasher. So, I shall extract the img.bin into the flasher folder and run the command: flasher -a img.bin -k zImage --flash-only=kernel -f -R, right?
Fuck yea, it worked!!
But I can't remove the Warranty Void message from terminal.