Software Requirements
Charge Your Phone
Ensure >50% battery to avoid shutdown during the process.
Install Framaroot via ADB
Run Framaroot
Check Results
This is the safest, most reliable method to achieve root. You will flash a custom recovery via Odin, then install the root file from within that recovery.
You will need Odin3 (version 3.07 or 3.09 works best for the Note 2). samsung n7100 root file 4.4.2 download
This is the step where most users get stuck.