Samsung Galaxy S4 Zoom LTE (SM-C105) Firmware Overview
What is the latest SM-C105 firmware?
C105XXUBOB1, released June 29, 2015 for region XSA with Android 4.4.2. The archive holds 2 official builds for this region.
Is the Samsung Galaxy S4 Zoom LTE still getting updates?
Most likely not: there has been no new firmware since June 2015, so Android 4.4.2 is the last version this model got. The final builds below are still the best choice for a clean reinstall.
SM-C105 firmware for region XSA
How to Flash SM-C105 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. Use HOME_CSC to keep your data, CSC for a full wipe.