Samsung Galaxy S4 Zoom LTE (SM-C105A) Firmware Overview
The archive lists 3 official builds for the Samsung Galaxy S4 Zoom LTE across 1 region (CSC). The newest one is C105AUBUAND1, released April 11, 2014 with Android Bean.
How to Flash SM-C105A Firmware
Put the Samsung Galaxy S4 Zoom LTE 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.