Samsung Galaxy Pocket Duos (GT-S5302B) Firmware Overview
What is the latest GT-S5302B firmware?
S5302BVJML1, released February 17, 2014 with Android 2.3.6. The archive holds 2 official builds across 1 region (CSC). Each one is the full stock ROM (flash file) for Odin, not an OTA patch.
Is the Samsung Galaxy Pocket Duos still getting updates?
Most likely not: there has been no new firmware since February 2014, so Android 2.3.6 is the last version this model got. The final builds below are still the best choice for a clean reinstall.
All GT-S5302B firmware builds
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. Use HOME_CSC to keep your data, CSC for a full wipe.