Ok guys. I'm writing this from the MI6 leaked 4.3 TOUCHWIZ N7100 ROM on my AT&T Note II.
DISCLAIMER: CELL CONNECTION DOESN'T WORK, NO SIM ERROR SO IT'S WIFI ONLY. IF ANYONE KNOWS HOW TO FIX THIS, PLEASE HELP
I CAN'T BE HELD RESPONSIBLE FOR DAMAGES. IT WORKS ON MY PHONE, IT MAY NOT WORK ON YOURS
Go to the n7100 Android Development Board and find Dr. Katan's MI6 build.
Download all 3 parts. V1,V2, and the 4.3 Mods.
Boot into recovery (I'm using Philz custom recovery)
Install V1, it'll start Aroma installer.
Choose to back up efs!!
MOI IMPORTANTE: DO NOT CHANGE THE MODEM
Aroma will ask you about the kernel: FLASH THE 4.3 STOCK KERNEL. (I know it shouldn't work, but it does)
I left everything else unchecked except when it asks about pushing firmware, I checked it.
Flash V2 the same way and the mods and there ya go.
I use Devil Kernel to dual boot and keep my 4.1 ROM on secondary ready to go.
Devil Kernel DOES NOT support 4.3 Touchwiz, so I have to flash the appropriate kernel first.