Android 4.1.2 with the firmware version N7100XXDMF3 is available for Galaxy Note 2 N7100. If your phone still not yet update to this latest version, then you can chose to either update via OTA or use Samsung Kies application.
Besides this, below has the official stock firmware version N7100XXDMF3 download link. You can download the firmware and manually flash into your Galaxy Note 2 via Odin application.
Note: Flash or modified Galaxy Note 2 firmware will void the phone warranty. Method below is only for your reference and only for the international Galaxy Note 2 N7100. Try it on your own risk. Before proceed to the flash the firmware via Odin Application, You can refer to the Hints and Tips for more info.
Download N7100XXDMF3: Link