Here are the stock firmware packages for Samsung Galaxy Note 10.1 Wifi GT-N8013. Just grab the most latest firmware file, as it brings a lot of bug-fixes and resolved known issues. These firmware packages were all officially released by Samsung itself. The stock firmware can only be use to unroot your device, as will as to manually update the device to its most latest Android firmware version.
Galaxy Note 10.1 Wifi GT-N8013 Android 4.1.2 Jelly Bean Firmware