Samsung Galaxy LIGHT (SGH-T399N) Firmware Overview
What is the latest SGH-T399N firmware?
T399NUVSAQA1, released February 15, 2017 with Android 4.4.2. The archive holds 4 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 LIGHT still getting updates?
Most likely not: there has been no new firmware since February 2017, so Android 4.4.2 is the last version this model got. The final builds below are still the best choice for a clean reinstall.
All SGH-T399N firmware builds
How to Flash SGH-T399N Firmware
Put the Samsung Galaxy LIGHT 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.