The latest firmware for Samsung Galaxy Tab S12 Ultra 5G (SM-X946N) is X946NKOU1AZH3 with Android 17, released on August 10, 2026 for 1 region (CSC). Every official firmware build for SM-X946N, 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/X946NKOU1AZH3

SM-X946B

SM-X940

SM-X846B

SM-X840

SM-X930N
You can find the firmware on the model: SM-X946N page.
Yes, all firmware files for SM-X946N are 100% official, original, and obtained directly from Samsung servers.
To flash SM-X946N, 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-X946N.
Yes. Every build on this page is the official stock ROM for SM-X946N from Samsung's update server, the same package other sites call the flash file or the software update. It installs with Odin on a Windows PC.
No. Factory Reset Protection is tied to the Google account that was on the phone and survives a firmware flash. Sign in with that account or use the legal options in our FRP guide.