
Samsung Galaxy M31
The latest firmware for Samsung Galaxy M31 (SM-M315F) is M315FXXU4CXJ6 with Android 12, released on October 4, 2024 for 3 regions (CSC). Every official firmware build for SM-M315F, 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/M315FXXU4CXJ6
SM-M315F started on Android 10 and has received 2 major Android upgrades; it now runs Android 12. The newest build, M315FXXU4CXJ6, was released on October 4, 2024. No new build has appeared for 25 months, so regular updates for this model have most likely ended.
Box codes of SM-M315F for different colors and markets. Firmware is chosen by the model code SM-M315F and your region (CSC), not by the SKU.

SM-M317F

SM-M326B

SM-M215G

SM-M325FV

SM-M307FN
The newest firmware for SM-M315F runs Android 12: build M315FXXU4CXJ6, released on October 4, 2024.
The latest build for SM-M315F, M315FXXU4CXJ6, was released on October 4, 2024 (2 years ago).
SM-M315F has had no new firmware for 25 months, so regular updates have most likely ended.
Yes, all firmware files for SM-M315F are 100% official, original, and obtained directly from Samsung servers.
To flash SM-M315F, 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-M315F.