
Samsung Galaxy GRAND DUOS
The latest firmware for Samsung Galaxy GRAND DUOS (GT-I9082) is I9082XXAMG3 with Jelly(Android Bean), released on July 24, 2013 for 1 region (CSC). Every official firmware build for GT-I9082, newest first: one row per build with all regions (CSC) that received it.
Each firmware build has its own page at https://samfirm.shop/build/{PDA}, where {PDA} is the build number from the list above. Example: https://samfirm.shop/build/I9082XXAMG3
All 29 builds in our database run Android 4.2.2 (Jelly). The newest build, I9082XXAMG3, was released on July 24, 2013. No new build has appeared for 161 months, so regular updates for this model have most likely ended.
Box codes of GT-I9082 for different colors and markets. Firmware is chosen by the model code GT-I9082 and your region (CSC), not by the SKU.

GT-I9308

GT-I9268

GT-I9228

GT-I9210

GT-I9108
The newest firmware for GT-I9082 runs Android 4.2.2 (Jelly): build I9082XXAMG3, released on July 24, 2013.
The latest build for GT-I9082, I9082XXAMG3, was released on July 24, 2013 (13 years ago).
GT-I9082 has had no new firmware for 161 months, so regular updates have most likely ended.
Yes, all firmware files for GT-I9082 are 100% official, original, and obtained directly from Samsung servers.
To flash GT-I9082, you need to download the appropriate firmware, put your device into Download Mode, and use the Odin tool to load the BL, AP, CP, and CSC files.
Downgrading is only possible if the bootloader version (binary bit) of the old firmware matches the current one. Always check the binary version before flashing GT-I9082.