Samsung Galaxy Note 2 (T-Mobile) SGH-T889 Firmware Overview
What is the latest SGH-T889 firmware?
T889UVUCOH4, released September 30, 2015 with Android 4.3. The archive holds 2 official builds across 1 region (CSC). Each one is the full stock ROM (flash file) for Odin, not an OTA patch.
Is the Samsung Galaxy Note 2 (T-Mobile) still getting updates?
Most likely not: there has been no new firmware since September 2015, so Android 4.3 is the last version this model got. The final builds below are still the best choice for a clean reinstall.
All SGH-T889 firmware builds
How to Flash SGH-T889 Firmware
Put the Samsung Galaxy Note 2 (T-Mobile) 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.