Did a dirty flash from KK 4.4.4. to this one ... no issues so far ! :D
Looks and feels great !!
Came from original CSC code : PHN, now active CSC code is: PHN / DBT.
That's OK for me as I don't want to wait any longer for the PHN update.
Also Knox still 0x0 as expected on my unrooted SM-N910F...