Samsung Galaxy Pocket Duos (GT-S5302B) Firmware Overview
The archive lists 2 official builds for the Samsung Galaxy Pocket Duos across 1 region (CSC). The newest one is S5302BVJML1, released February 17, 2014 with Android 2.3.6.
How to Flash GT-S5302B Firmware
Put the Samsung Galaxy Pocket Duos 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.