
Samsung Galaxy Jean
The latest firmware for Samsung Galaxy Jean (SM-A605K) is A605KKKS3CVH2 with Android 10, released on September 15, 2022 for 1 region (CSC). Every official firmware build for SM-A605K, 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/A605KKKS3CVH2
SM-A605K started on Android 8 and has received 2 major Android upgrades; it now runs Android 10. The newest build, A605KKKS3CVH2, was released on September 15, 2022. No new build has appeared for 50 months, so regular updates for this model have most likely ended.
Specifications of SM-A605F, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

SM-A605GN

SM-A600A

SM-A606Y

SM-A500X

SM-A700X
The newest firmware for SM-A605K runs Android 10: build A605KKKS3CVH2, released on September 15, 2022.
The latest build for SM-A605K, A605KKKS3CVH2, was released on September 15, 2022 (4 years ago).
SM-A605K has had no new firmware for 50 months, so regular updates have most likely ended.
Yes, all firmware files for SM-A605K are 100% official, original, and obtained directly from Samsung servers.
To flash SM-A605K, 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-A605K.