
Samsung Galaxy A21s
The latest firmware for Samsung Galaxy A21s (SM-A217N) is A217NKSUBDXJ1 with Android 12, released on October 3, 2024 for 4 regions (CSC). Every official firmware build for SM-A217N, 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/A217NKSUBDXJ1
SM-A217N started on Android 10 and has received 2 major Android upgrades; it now runs Android 12. The newest build, A217NKSUBDXJ1, was released on October 3, 2024. No new build has appeared for 25 months, so regular updates for this model have most likely ended.
Specifications of SM-A217F, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

SM-A217M

SM-A215U1

SM-A310X

SM-A115A

SM-A226BR
The newest firmware for SM-A217N runs Android 12: build A217NKSUBDXJ1, released on October 3, 2024.
The latest build for SM-A217N, A217NKSUBDXJ1, was released on October 3, 2024 (2 years ago).
SM-A217N has had no new firmware for 25 months, so regular updates have most likely ended.
Yes, all firmware files for SM-A217N are 100% official, original, and obtained directly from Samsung servers.
To flash SM-A217N, 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-A217N.