
Samsung Galaxy Tab A8
Every official firmware build for SM-X205N, 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/X205NKOS6DYH1
Box codes of SM-X205N for different colors and markets. Firmware is chosen by the model code SM-X205N and your region (CSC), not by the SKU.

SM-X946B

SM-X846B

SM-X840

SM-X940

SM-X110N

SM-X350N

SM-X300N

SM-X210N
You can find the firmware on the model: SM-X205N page.
Yes, all firmware files for SM-X205N are 100% official, original, and obtained directly from Samsung servers.
To flash SM-X205N, 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-X205N.