If you have installed a lot of custom ROMs in the past on your Samsung Galaxy Note 2 N7100, you might be thinking of rolling back to official firmwares to resell your device or to start afresh. Here is the link to download official Galaxy Note 2 android 4.4.2 ROM.
Download Note 2 N7100 Android 4.4.2 Official ROM Installation instructions
Extract (unzip) the firmware file
Download Odin v3.10.6
Extract Odin ZIP file
Open Odin v.3.10.6
Reboot Phone in Download Mode (press and hold Home + Power + Volume Down buttons)
Connect phone and wait until you get a blue sign in Odin
Add the firmware file to AP / PDA
Make sure re-partition is NOT ticked
Click the start button, sit back and wait few minutes
This ROM will install the stock bootloader, remove root access and all files stored in the internal storage.