
Samsung Galaxy Tab S3
The latest firmware for Samsung Galaxy Tab S3 (SM-T827V) is T827VVRS3CTB1 with Android 9 (Pie), released on February 4, 2020 for 1 region (CSC). Every official firmware build for SM-T827V, 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/T827VVRS3CTB1
SM-T827V started on Android 7 and has received 2 major Android upgrades; it now runs Android 9 (Pie). The newest build, T827VVRS3CTB1, was released on February 4, 2020. No new build has appeared for 81 months, so regular updates for this model have most likely ended.

SM-T827R4

SM-T825Y

SM-T727A

SM-T837A

SM-T810X
The newest firmware for SM-T827V runs Android 9 (Pie): build T827VVRS3CTB1, released on February 4, 2020.
The latest build for SM-T827V, T827VVRS3CTB1, was released on February 4, 2020 (6 years ago).
SM-T827V has had no new firmware for 81 months, so regular updates have most likely ended.
Yes, all firmware files for SM-T827V are 100% official, original, and obtained directly from Samsung servers.
To flash SM-T827V, 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-T827V.