Samsung Galaxy S4 (Snapdragon/Tracfone) (SM-S975L) Firmware Overview
The archive lists 2 official builds for the Samsung Galaxy S4 (Snapdragon/Tracfone) across 1 region (CSC). The newest one is S975LUDUANB1, released February 4, 2014 with Android Bean.
How to Flash SM-S975L Firmware
Put the Samsung Galaxy S4 (Snapdragon/Tracfone) 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.