
Samsung Galaxy Tab A 8.0
The latest firmware for Samsung Galaxy Tab A 8.0 (SM-T355) is T355XXS1CTL3 with Android 7.1.1 (Nougat), released on January 6, 2021 for 11 regions (CSC). Every official firmware build for SM-T355, 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/T355XXS1CTL3
SM-T355 started on Android 5 and has received 2 major Android upgrades; it now runs Android 7.1.1 (Nougat). The newest build, T355XXS1CTL3, was released on January 6, 2021 with the August 2017 security patch. No new build has appeared for 70 months, so regular updates for this model have most likely ended.
Specifications of SM-T355Y, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.
• The security of your device has been improved.
Box codes of SM-T355 for different colors and markets. Firmware is chosen by the model code SM-T355 and your region (CSC), not by the SKU.

SM-T355C

SM-T350X

SM-T357W

SM-T2558

SM-T365Y
The newest firmware for SM-T355 runs Android 7.1.1 (Nougat): build T355XXS1CTL3, released on January 6, 2021.
The latest build for SM-T355, T355XXS1CTL3, was released on January 6, 2021 (5 years ago).
SM-T355 has had no new firmware for 70 months, so regular updates have most likely ended.
Yes, all firmware files for SM-T355 are 100% official, original, and obtained directly from Samsung servers.
To flash SM-T355, 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-T355.