
Samsung Galaxy Tab Pro 8.4
The latest firmware for Samsung Galaxy Tab Pro 8.4 (SM-T320) is T320ZSS1BQC1 with Android 4.4.2 (KitKat), released on April 27, 2017 for 2 regions (CSC). Every official firmware build for SM-T320, 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/T320ZSS1BQC1
All 26 builds in our database run Android 4.4.2 (KitKat). The newest build, T320ZSS1BQC1, was released on April 27, 2017. No new build has appeared for 115 months, so regular updates for this model have most likely ended.
Box codes of SM-T320 for different colors and markets. Firmware is chosen by the model code SM-T320 and your region (CSC), not by the SKU.

SM-T320X

SM-T321

SM-T310X

SM-T330X

SM-T337V
The newest firmware for SM-T320 runs Android 4.4.2 (KitKat): build T320ZSS1BQC1, released on April 27, 2017.
The latest build for SM-T320, T320ZSS1BQC1, was released on April 27, 2017 (9 years ago).
SM-T320 has had no new firmware for 115 months, so regular updates have most likely ended.
Yes, all firmware files for SM-T320 are 100% official, original, and obtained directly from Samsung servers.
To flash SM-T320, 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-T320.