Samsung Galaxy Win (GT-I8550E) Firmware Overview
The archive lists 4 official builds for the Samsung Galaxy Win across 1 region (CSC). The newest one is I8550EUHUANH2, released March 16, 2015 with Android Bean.
How to Flash GT-I8550E Firmware
Put the Samsung Galaxy Win 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.