sometimes, i get caught in a bootloop too. I usually find that the /data partition is whacked thus either stuck at boot or bootloop.
so, if I pull the battery and get it to go into recovery and factory reset it rebuilds the /data partition.
the more extreme case, if i had an earlier pre NC2/NC4 build, where there was no recovery partition - I had to follow the instructions earlier in this thread, grab the pit file and MJE tar, and practically start over.
so, be cautious about whacking the /data (and / or /cache) partitions -
related but unrelated - has anyone offered a bounty for unlocking the bootloader on note 3, with a bonus round going to the developer who can figure out how to position the phone to be able to flash NC2 after having flashed NC4...