
Samsung Galaxy M20
The latest firmware for Samsung Galaxy M20 (SM-M205N) is M205NKSU7BVG3 with Android 10, released on August 4, 2022 for 1 region (CSC). Every official firmware build for SM-M205N, 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/M205NKSU7BVG3
SM-M205N started on Android 9 and has received 1 major Android upgrade; it now runs Android 10. The newest build, M205NKSU7BVG3, was released on August 4, 2022. No new build has appeared for 51 months, so regular updates for this model have most likely ended.
Specifications of SM-M205F, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

SM-M085F

SM-M476B

SM-M076B

SM-M176B

SM-M075F

SM-M366B

SM-M566B

SM-M166P
The newest firmware for SM-M205N runs Android 10: build M205NKSU7BVG3, released on August 4, 2022.
The latest build for SM-M205N, M205NKSU7BVG3, was released on August 4, 2022 (4 years ago).
SM-M205N has had no new firmware for 51 months, so regular updates have most likely ended.
Yes, all firmware files for SM-M205N are 100% official, original, and obtained directly from Samsung servers.
To flash SM-M205N, 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-M205N.