
Samsung Galaxy Core
The latest firmware for Samsung Galaxy Core (SM-G386W) is G386WVLS1AQB1 with Android 4.4.2 (KitKat), released on March 8, 2017 for 12 regions (CSC). Every official firmware build for SM-G386W, 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/G386WVLS1AQB1
All 10 builds in our database run Android 4.4.2 (KitKat). The newest build, G386WVLS1AQB1, was released on March 8, 2017. No new build has appeared for 117 months, so regular updates for this model have most likely ended.
Specifications of SM-G386F, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

SM-G386U

SM-G3819

SM-G388F

SM-G3858

SM-G390W
The newest firmware for SM-G386W runs Android 4.4.2 (KitKat): build G386WVLS1AQB1, released on March 8, 2017.
The latest build for SM-G386W, G386WVLS1AQB1, was released on March 8, 2017 (9 years ago).
SM-G386W has had no new firmware for 117 months, so regular updates have most likely ended.
Yes, all firmware files for SM-G386W are 100% official, original, and obtained directly from Samsung servers.
To flash SM-G386W, 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-G386W.