
Samsung Galaxy Tab E8.0
The latest firmware for Samsung Galaxy Tab E8.0 (SM-T378V) is T378VVRS7BUE2, released on May 10, 2021 for 1 region (CSC). Every official firmware build for SM-T378V, 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/T378VVRS7BUE2
SM-T378V started on Android 7 and has received 1 major Android upgrade; it now runs Android 8.1.0 (Nougat). The newest build, T378VVRS7BUE2, was released on May 10, 2021. No new build has appeared for 66 months, so regular updates for this model have most likely ended.

SM-T378S

SM-T377V

SM-T387V

SM-T365Y

SM-T385S
The newest firmware for SM-T378V runs Android 8.1.0 (Nougat): build T378VVRS7BUE2, released on May 10, 2021.
The latest build for SM-T378V, T378VVRS7BUE2, was released on May 10, 2021 (5 years ago).
SM-T378V has had no new firmware for 66 months, so regular updates have most likely ended.
Yes, all firmware files for SM-T378V are 100% official, original, and obtained directly from Samsung servers.
To flash SM-T378V, 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-T378V.