
Samsung Galaxy Tab S10 Lite, 128 GB, CoralRed
Every official firmware build for SM-X400N, newest first: one row per build with all regions (CSC) that received it.
Box codes of SM-X400N for different colors and markets. Firmware is chosen by the model code SM-X400N and your region (CSC), not by the SKU.

SM-X400

SM-X300N

SM-X308U

SM-X510N

SM-X516N
You can find the firmware on the model: SM-X400N page.
Yes, all firmware files for SM-X400N are 100% official, original, and obtained directly from Samsung servers.
To flash SM-X400N, 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-X400N.