Use this :
Backup everything to your external sd or pc.
In TWRP go to Wipe and wipe Internal Storage, System and Data.
Flash mk3 modem and then the rooted or unrooted version of 4.3.
It will take forever to boot, because it's moving the files in / to /0, that's why is faster copying everything to sd or pc and wiping internal storage(won't be anything to move).
Then setup everything and copy back your files to internal storage.
Sent from my Note's unrootable chinese clone.