
Samsung GALAXY S4
The latest firmware for Samsung GALAXY S4 (SGH-M919) is M919UVUFOK3 with Android 4.4.4 (KitKat), released on November 17, 2015 for 1 region (CSC). Every official firmware build for SGH-M919, 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/M919UVUFOK3
All 5 builds in our database run Android 4.4.4 (KitKat). The newest build, M919UVUFOK3, was released on November 17, 2015. No new build has appeared for 133 months, so regular updates for this model have most likely ended.

SGH-I927

SGH-S730M

SGH-T999N

SGH-T989D

SGH-T859

SGH-T599V

SGH-I757M

SGH-I747
The newest firmware for SGH-M919 runs Android 4.4.4 (KitKat): build M919UVUFOK3, released on November 17, 2015.
The latest build for SGH-M919, M919UVUFOK3, was released on November 17, 2015 (10 years ago).
SGH-M919 has had no new firmware for 133 months, so regular updates have most likely ended.
Yes, all firmware files for SGH-M919 are 100% official, original, and obtained directly from Samsung servers.
To flash SGH-M919, 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 SGH-M919.