الحل منقول ومجرب من طرفي
I have tested two version of firmware:
XXUENA6
XXUENB4
For both version, unlock\repair works fine.
Firstly, root your phone with this file: CF-Root Download (flash as PDA with Odin).
Then, open SuperSU app and disable Knox (there is a popup that ask if you want to try to disable knox).
Now, open SPT Software, connect phone in Download mode to pc with normal microusb cable and do a Reset EFS from software.
When phone reboot, connect it with RJ45 Cable, type *#0808# on phone and select DM+MODEM+ADB;
Choose Super IMEI from list, tick Repair IMEI, select com port of box and do Factory Mode.
Phone reboots again... Now, type *#7284#, select Modem, and click on Repair 3G Network...
If you have 2G signal problem, repair 3G network selecting n900w8 as model and all works fine
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