How to Root Samsung Galaxy Note 8 GT-N5100 (4.4.2 KitKat Firmware):

1. Files needed

• USB Driver
  http://downloadcenter.samsung.com/content/SW/201410/20141017131240597/SAMSUNG_USB_Driver_for_Mobile_Phones.exe

• CF-Auto-Root Package (for Samsung GT-N5100)
  http://download.chainfire.eu/317/CF-Root/CF-Auto-Root/CF-Auto-Root-kona3g-kona3gxx-gtn5100.zip

• Odin3
  (included in CF-Auto-Root Package)

2. Preparation

• [on Note8] Enable USB Debugging
  Settings => About Device => Tap “Build Number” repeatedly (7 times)
  [Developer Options Menu will appear]
  Settings => Developer Options => USB Debugging [enabled]

• [on Note8] Check battery percentage
  At least 50% remain

• [on PC] Install USB Driver

3. Rooting:

• [on PC] Extract CF-Auto-Root-kona3g-kona3gxx-gtn5100.zip
• [on PC] Run Odin3-v3.07.exe
  From CF-Auto-Root-kona3g-kona3gxx-gtn5100.zip extraction
• [on Note8] Reboot Note8 to Download Mode
  Press “Volume Down + Home + Power” buttons until “Warning!!” screen appear
  Press “Volume Up” to continue
• [on PC] Plug Note8 to PC with USB Data Cable
  Make sure Odin3 detect Note8 by “Added!!” message appear
• [on Odin3] Press “PDA” button in Odin3
  And select CF-Auto-Root-kona3g-kona3gxx-gtn5100.tar.md5 file from CF-Auto-Root-kona3g-kona3gxx-gtn5100.zip extraction
• [on Odin3] Press “Start”
  Flashing kernel started
• [on Note8] Note8 will be rooted and reboot
  Unplug USB Data Cable
  After Note8 start, check that SuperSU has been installed
  Check with Root Checker application
• Congratulation, Note8 has been rooted successfully

Source:

– http://androidcentral.us/2014/05/root-galaxy-note-8-0-n5100-4-4-2-kitkat/

– http://www.wugfresh.com/faq/6/