
Samsung Galaxy Tab A (2017)
The latest firmware for Samsung Galaxy Tab A (2017) (SM-T385S) is T385SKSS2CUD2 with Android 9 (Pie), released on April 29, 2021 for 1 region (CSC). Every official firmware build for SM-T385S, 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/T385SKSS2CUD2
SM-T385S started on Android 7 and has received 2 major Android upgrades; it now runs Android 9 (Pie). The newest build, T385SKSS2CUD2, was released on April 29, 2021. No new build has appeared for 66 months, so regular updates for this model have most likely ended.
Specifications of SM-T385M, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

SM-T385M

SM-T387V

SM-T378V

SM-T377V

SM-T395C
The newest firmware for SM-T385S runs Android 9 (Pie): build T385SKSS2CUD2, released on April 29, 2021.
The latest build for SM-T385S, T385SKSS2CUD2, was released on April 29, 2021 (5 years ago).
SM-T385S has had no new firmware for 66 months, so regular updates have most likely ended.
Yes, all firmware files for SM-T385S are 100% official, original, and obtained directly from Samsung servers.
To flash SM-T385S, 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-T385S.