Samsung SGH-T889 Firmware Overview
The archive lists 2 official builds for the Samsung SGH-T889 across 1 region (CSC). The newest one is T889UVUCOH4, released September 30, 2015 with Android 4.3.
How to Flash SGH-T889 Firmware
Put the Samsung SGH-T889 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.