Samsung Galaxy TabPRO 8.4 Wi-Fi (SM-T320NU) Firmware Overview
The archive lists 2 official builds for the Samsung Galaxy TabPRO 8.4 Wi-Fi across 1 region (CSC). The newest one is T320NUUEU1AOB8, released March 11, 2015 with Android 4.4.2. It is a feature update on bootloader binary 1: once a phone runs it, firmware with a lower binary can no longer be flashed (how to read a build number).
How to Flash SM-T320NU Firmware
Put the Samsung Galaxy TabPRO 8.4 Wi-Fi into Download Mode, load the BL, AP, CP and CSC files into Odin on a Windows PC and press Start. Pick a build with the same or a higher Bit than the one installed — a lower bootloader binary will be rejected.