
Samsung GALAXY S5
The latest firmware for Samsung GALAXY S5 (SM-S902L) is S902LUDUAOD3 with Android 4.4.2 (KitKat), released on April 9, 2015 for 1 region (CSC). Every official firmware build for SM-S902L, 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/S902LUDUAOD3
All 2 builds in our database run Android 4.4.2 (KitKat). The newest build, S902LUDUAOD3, was released on April 9, 2015. No new build has appeared for 140 months, so regular updates for this model have most likely ended.

SM-S906L

SM-S9080

SM-S9010

SM-S918Q

SM-S911C
The newest firmware for SM-S902L runs Android 4.4.2 (KitKat): build S902LUDUAOD3, released on April 9, 2015.
The latest build for SM-S902L, S902LUDUAOD3, was released on April 9, 2015 (11 years ago).
SM-S902L has had no new firmware for 140 months, so regular updates have most likely ended.
Yes, all firmware files for SM-S902L are 100% official, original, and obtained directly from Samsung servers.
To flash SM-S902L, 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 SM-S902L.