
Samsung Galaxy FEEL
The latest firmware for Samsung Galaxy FEEL (GT-I8580) is I8580ZNUAOG1 with Android 4.2.2 (Jelly), released on July 22, 2015 for 1 region (CSC). Every official firmware build for GT-I8580, 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/I8580ZNUAOG1
All 10 builds in our database run Android 4.2.2 (Jelly). The newest build, I8580ZNUAOG1, was released on July 22, 2015. No new build has appeared for 137 months, so regular updates for this model have most likely ended.
Box codes of GT-I8580 for different colors and markets. Firmware is chosen by the model code GT-I8580 and your region (CSC), not by the SKU.

GT-I9308

GT-I9268

GT-I9228

GT-I9210

GT-I9108
The newest firmware for GT-I8580 runs Android 4.2.2 (Jelly): build I8580ZNUAOG1, released on July 22, 2015.
The latest build for GT-I8580, I8580ZNUAOG1, was released on July 22, 2015 (11 years ago).
GT-I8580 has had no new firmware for 137 months, so regular updates have most likely ended.
Yes, all firmware files for GT-I8580 are 100% official, original, and obtained directly from Samsung servers.
To flash GT-I8580, 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-I8580.