[Q] help for error on s4
i have phone s4 android 4.3 with root and it's working fine, but
i install app rom switcher and install CM11 and i really like it and it's good but i restart s4 and phone not load anymore
only show Samsung galaxy s4 i9500 then get black screen
i try join to download mode and it's open and i try open recovery and it's get recovery rom switcher
then i download Firmware ( I9500XXUFNB3_I9500SERFNB3_I9500XXUFNA6_HOME.tar ) android 4.2.2
and install it and after open show me massage you need wipe factory and i open recovery and do it
and phone working good but when i try root phone again with file " CF-Auto-Root-ja3g-ja3gxx-gti9500.tar.md5 "
after phone open i not see super user and no root
and i see new words on download mode
KNOX WARRANTY VOID: 1
RP SWREV : A3
THE QUESTION HERE :
why phone show this words after update ?
and why i can't root phone ?
sorry for my bad English