Home Stock Firmware Galaxy Tab S6 5G SM-T866N U4 Firmware – Android 11 R

Galaxy Tab S6 5G SM-T866N U4 Firmware – Android 11 R

Galaxy Tab S6 5G SM-T866N Binary 4

The specific Galaxy Tab S6 5G SM-T866N U4 Firmware Download Package comes with a Stock ROM of Galaxy Tab S6 5G SM-T866N U4. This helps you to bypass the FRP lock and revert from the root and custom ROM.

Samsung Galaxy Tab S6 5G SM-T866N Binary 4 Firmware – Android 11 R – KOO – South Korea – T866NKOS4CUL1

There are various reasons to flash “Stock Firmware on Galaxy Tab S6 5G SM-T866N U4“. For example, your phone will be stuck or hang on the logo. You want to remove the FRP lock from it.

If you’re going to reset your phone hard and you cannot access the recovery menu. But most of the problems that cause flashing stock ROM are below.

The Advantages Of Stock ROM:

  • Flash Stock ROM to solve the boot loop issue
  • Update and Downgrade
  • Unroot or Fix Bugs on the phone
  • To solve the lag or stutter
  • By flashing Stock ROM, you can fix software issues.
  • Revert to stock to get your warranty.


Galaxy Tab S6 5G SM-T866N U4 Stock ROM Details:

SM-T866N U4 KOO – South Korea – T866NKOS4CUL1:

Model SM-T866N Binary 4 U4, S4, Bit 4
Region / Country South Korea
Language Multi-Language
Android version Android 11 R
Operator / Carrier Clean (no logo, carrier apps)
CP Version / Baseband Modem T866NKOU4CUK2
product code KOO
Build Date 2021-12-07
Security Patch Level
Size 4.83GB Full Files
Download Google Drive Mega

How To Install Galaxy Tab S6 5G SM-T866N U4 Stock Firmware:

Download the Odin and USB Drivers on your PC. Follow the below link to install the firmware using the Odin Flash tool.

How To Flash Samsung Stock Firmware With ODIN

1: Download and Install the Samsung USB Driver on your computer. If a Samsung USB Driver is already installed on your computer, then Skip this Step.


2: Download and extract the  Galaxy Tab S6 5G SM-T866N U4 Firmware  files on your computer.

3: Now, Switch off your Smartphone.

4: After switching off the phone, you need to boot into Download Mode. To boot into download mode.

Press and hold Volume Down, Home, and Power button at the same time for 5-8 seconds until download mode is active.

5: In the Download mode, you will be able to see a Warning Yellow Triangle Sign. In this situation, you have to press the Volume Up key to continue.

6: Now, Download and open Odin. Then, connect your Smartphone to the computer.

7: Once you have connected the Smartphone to the computer, Odin will automatically recognize the device and show the “Added” message on the lower-left panel.

8: Once Odin detects your device, click on the PDA button and select the Firmware.tar file.


9: Now, click on the Start button in Odin to begin the Flashing.

10: Flashing usually takes 30-50 seconds to complete the process on your Phone.

Once the Firmware process is completed, you will be able to see a Green Box with a Pass written on it in Odin. During this process, the Smartphone will reboot automatically.

Once you see the Pass message in Odin, you can disconnect your Device from the computer.

The flashing process will begin and should take about 10–12 minutes. It may take some time for your device to reboot, but don’t be alarmed.

When your Galaxy Tab S6 5G SM-T866N U4 finally boots up, you should now be running your desired firmware.

If you want to check that the correct firmware is installed, head to Settings –> About Phone –> Software Information. The firmware number is located under the “Baseband version.”


  • Please read and understand the Full Guide before flashing “Galaxy Tab S6 5G SM-T866N U4 Firmware.
  • Use these instructions at your own risk. We will not be responsible for everything that happens to your device resulting from the use of the information in this guide.
  • Before flashing, Stock ROM must have a 70–80% charge.

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Always had a strong interest in the Android operating system. Experience with Git and self-hosted WordPress blogs led him to the understanding that an online presence was the logical next step for his business. It's about uniqueness and individuality!


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