Samsung Galaxy Tab PRO 12.2 (WiFi) (SM-T900) Firmware Overview
What is the latest SM-T900 firmware?
T900XXSBPL3, released April 17, 2017 for region DBT with Android 5.1.1. The archive holds 2 official builds for this region.
Is the Samsung Galaxy Tab PRO 12.2 (WiFi) still getting updates?
Most likely not: there has been no new firmware since April 2017, so Android 5.1.1 is the last version this model got. The final builds below are still the best choice for a clean reinstall.
SM-T900 firmware for region DBT
How to Flash SM-T900 Firmware
Put the Samsung Galaxy Tab PRO 12.2 (WiFi) 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.