I AM NOT RESPONSIBLE IF YOUR PHONE BLOWS UP, KILLS JUSTIN BIEBER OR BRICKS. DO AT YOUR OWN RISK!!!!
Ill try to make it as simple as possible with step by step instructions
STEP 1: Download the 4.1.1 LJ2 firmware from Sammobile and extract to Desktop or somewhere convenient (need and account)
STEP 2: Download Odin 3.07 or your preferred choice, open Odin
STEP 3: Put your Note 2 in Download Mode and plug into a RELIABLE usb port and a RELIABLE usb cable (preferably the white Samsung cable) and wait for it to show up in Odin (COM5 or something like that)
STEP 4: Click the PDA slot in Odin and locate the LJ2 4.1.1 firmware and wait for it to verify, it may look like the program freezes but its just verifying the md5 firmware.
BEFORE ANYTHING MAKE SURE IN THE OPTION AREA ONLY AUTO REBOOT AND F.RESET TIME ARE CHECKED!!!
STEP 5: Click START and wait. After a while Odin should say RESET in the BOX above the Option area
Did you notice that you note doesn't boot after a while?? This is because of left over 4.3 file not letting the system boot. Pull the battery and let the phone sit for a few seconds, pop the battery in and boot into stock recovery (HOLD VOL UP+HOME+POWER) and do a FACTORY RESET then reboot.
STEP 6: SUCESS!! If you did everything right your phone should boot into 4.1.1.
Click thanks if this helped you get unlocked and murder KNOX.