
Samsung Galaxy Ace4 Lite
The latest firmware for Samsung Galaxy Ace4 Lite (SM-G316U) is G316UUHU0AQB1 with Android 4.4.4 (KitKat), released on February 9, 2017 for 1 region (CSC). Every official firmware build for SM-G316U, 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/G316UUHU0AQB1
All 3 builds in our database run Android 4.4.4 (KitKat). The newest build, G316UUHU0AQB1, was released on February 9, 2017. No new build has appeared for 118 months, so regular updates for this model have most likely ended.

SM-G316MY

SM-G313MY

SM-G318MZ

SM-G310HN

SM-G5109
The newest firmware for SM-G316U runs Android 4.4.4 (KitKat): build G316UUHU0AQB1, released on February 9, 2017.
The latest build for SM-G316U, G316UUHU0AQB1, was released on February 9, 2017 (9 years ago).
SM-G316U has had no new firmware for 118 months, so regular updates have most likely ended.
Yes, all firmware files for SM-G316U are 100% official, original, and obtained directly from Samsung servers.
To flash SM-G316U, 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-G316U.