Samsung Galaxy Tab PRO 10.1 (SM-T520) Firmware Overview
What is the latest SM-T520 firmware?
T520UESAQA4, released February 13, 2017 for region XAC with Android 4.4.2. The archive holds 2 official builds for this region.
Is the Samsung Galaxy Tab PRO 10.1 still getting updates?
Most likely not: there has been no new firmware since February 2017, so Android 4.4.2 is the last version this model got. The final builds below are still the best choice for a clean reinstall.
SM-T520 firmware for region XAC
How to Flash SM-T520 Firmware
Put the Samsung Galaxy Tab PRO 10.1 into Download Mode, load the BL, AP, CP and CSC files into Odin on a Windows PC and press Start. Use HOME_CSC to keep your data, CSC for a full wipe.