First, install new, clean version of 4.4.2 Android (I used XEO version for Poland).
Upload it by Odin like every other rom.
After it reboots and system is working, upload this recovery by Odin:
Chect does it work by using 3key-combo, to get into CWM during boot.
If it works, put on the phone memory file with root:
Install it in CWM mode, and reboot phone from CWM level (it will ask to "fix root permissions" - selsct YES).
After reboot phone should have ROOT access, and install the Busybox also..