
Samsung Galaxy S3 CDMA (Korea SKT)
The latest firmware for Samsung Galaxy S3 CDMA (Korea SKT) (SHW-M440S) is M440SKSUGOH1 with Android 4.3 (Jelly), released on August 3, 2015 for 1 region (CSC). Every official firmware build for SHW-M440S, 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/M440SKSUGOH1
All 3 builds in our database run Android 4.3 (Jelly). The newest build, M440SKSUGOH1, was released on August 3, 2015. No new build has appeared for 136 months, so regular updates for this model have most likely ended.

SHW-M486W

SHW-M585D

SHW-M570S

SHW-M500W
The newest firmware for SHW-M440S runs Android 4.3 (Jelly): build M440SKSUGOH1, released on August 3, 2015.
The latest build for SHW-M440S, M440SKSUGOH1, was released on August 3, 2015 (11 years ago).
SHW-M440S has had no new firmware for 136 months, so regular updates have most likely ended.
Yes, all firmware files for SHW-M440S are 100% official, original, and obtained directly from Samsung servers.
To flash SHW-M440S, 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 SHW-M440S.