Samsung Galaxy Grand (GT-I9128I) Firmware Overview
The archive lists 3 official builds for the Samsung Galaxy Grand across 1 region (CSC). The newest one is I9128IZMUANB2, released March 6, 2014 with Android Bean.
How to Flash GT-I9128I Firmware
Put the Samsung Galaxy Grand 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.