Samsung Galaxy Ch@t (GT-B5330) Firmware Overview
What is the latest GT-B5330 firmware?
B5330XWUBNJ1, released November 25, 2014 for region XTE with Android 4.1.2. The archive holds 2 official builds for this region.
Is the Samsung Galaxy Ch@t still getting updates?
Most likely not: there has been no new firmware since November 2014, so Android 4.1.2 is the last version this model got. The final builds below are still the best choice for a clean reinstall.
GT-B5330 firmware for region XTE
How to Flash GT-B5330 Firmware
Put the Samsung Galaxy Ch@t 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.