
Samsung Galaxy Ace4
Every official firmware build for SM-G316H, newest first: one row per build with all regions (CSC) that received it.

SM-G316MY

SM-G313MY

SM-G318MZ

SM-G310HN

SM-G5109
You can find the firmware on the model: SM-G316H page.
Yes, all firmware files for SM-G316H are 100% official, original, and obtained directly from Samsung servers.
To flash SM-G316H, 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-G316H.