
Samsung Galaxy Tab S11 Ultra, 1 TB, Silver
Every official firmware build for SM-X930N, newest first: one row per build with all regions (CSC) that received it.

SM-X930

SM-X946B

SM-X940

SM-X926N

SM-X920
You can find the firmware on the model: SM-X930N page.
Yes, all firmware files for SM-X930N are 100% official, original, and obtained directly from Samsung servers.
To flash SM-X930N, 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-X930N.