1st thing. When you root your tab knox gets tripped. no way around this. So if this is a deal breaker, step on it and take it back. you will not get root love however.
If you do want Root, knox is tripped so why not? Follow these steps.
1. charge your tablet.
2. Down load these files.
Recovery Boot img nb3
TWRP Custom Recovery
Stock NC5 Firmware
CF-AutoRoot (go to His Post in General Section)
When charged, boot into download mode and flash the full stock package. (PDA in 3.07, AP in 3.09 ODIN) don't mess with the check boxes, when it finisheh verifying the md5 just hit start... Go take a break...
When that is done you will be back to stock, original just like you bought it.
Now boot back in to download mode and this time you are going to flash the NB3 recovery image tar... same place in ODIN as before. ( uncheck reboot in ODIN)
When that completes, disconnect your tablet and boot it back into download mode.
When you are back in Download mode, then you can safely flash the CF-AutoRoot.... (leave checks default and flash it in same slot in ODIN.
Finally, when that reboots, go back into odin and flash the custom recovery and then you will be able to boot into recovery and make a back up, (always good to make a back up) you can restore back to point in time. (that you made the backup.)
after you are all done, you can get Xposed installed and tweak the hell out if your rom. At minimum install Titanium Back up and freeze all of the knox apps.
DUDE!!! THANK YOU!!!! You saved me!!!! I was at the yellow exclamation point because I got stuck at the Samsung logo...I was rooted and it all was working fine. Then I installed Chromecast and something went haywire (I have NO clue how that app caused an issue?) I tried Kies and that didn't recognize my device. Your advice worked FLAWLESSLY!!! THANK YOU so much!!!!