How to Unroot Galaxy S9/S9 Plus w/ Stock Firmware!

If you mess up a step while rooting your Galaxy S9 or S9 Plus or maybe you just want to go back to stock firmware, you can easily do it using ODIN and stock firmware files.  Btw, process is identical for all Galaxy smartphones except the firmware file is different.

Before beginning, download all the files you will need:

Download ODIN & Drivers – Link

Download Galaxy S9 & S9 Plus firmware – Link

Step 1. Power off your Galaxy S9 or S9 Plus, then hold down Volume Down, Bixby, and Power buttons for about 5 seconds until you see a warning scree.

Step 2. Hit the Volume Up key to enter ODIN download mode and connect a USB cable from your Galaxy S9/S9 Plus to your Windows computer.  FYI, you will need a Windows computer do unroot your Galaxy S9 or S9 Plus as ODIN is a software only supported by Windows.

Step 3. Unzip the ODIN zip file you downloaded earlier and run the ODIN EXE program(the file ending in EXE).

You should see a blue-highlighted box with random COM number if you previously installed the Samsung USB drivers.  If you don’t see that box at this point, simply run the Samsung USB EXE driver installation program you downloaded earlier.  Then unplug/re-plug your USB cable to your S9/S9 Plus and you will see it.  If you still don’t see it, try another USB port and do not use a USB hub as sometimes they interfere with it.

Next, unzip the stock firmware zip file you downloaded earlier.

Next, choose “BL” and select the firmware file starting with “BL”.

Next, choose “CP” and select the firmware file starting with “CP”.

Next, choose “AP” and select the firmware file starting with “AP”.

Now, in most cases, you do not need to select “CSC” as it only changes your CSC.  I don’t personally flash it ever but if you don’t want to lose data, choose “CSC” and select the firmware file starting with “Home CSC”.  If you are installing on top of a stock firmware or unrooting stock firmware, this will allow you to keep data.  But MAKE A BACKUP of EVERYTHING before preceding as you can still mess up(beginner’s luck) and it is always good idea to backup anything important.(You can use Samsung Smart Switch app to backup all your apps and important data, which comes with your phone, do a search in the app search bar for “smart switch”.)

NOTE: If you do NOT FLASH CSC, ODIN WILL ERASE EVERYTHING ON YOUR PHONE except your microSD card storage!!!

When ready, hit “Start” button and the stock firmware will begin flashing, it should take around 5-10 minutes and reboot by itself.


Step 4. Once done, your Galaxy S9/S9 Plus will reboot by itself and boot to a fresh Welcome screen OR simply boot if you used “Home CSC”.

Note: DO NOT use “Home_CSC” if you are coming from a custom ROM(if you are on a custom ROM and unrooting) as the data will not be compatible and you may end up in a nasty bootloop(you can also fix this by doing a factory reset in stock recovery, which will erase EVERYTHING on your phone or you can also re-install TWRP recovery and do a factory reset there, which will allow you to keep your personal files on the internal storage and only reset your apps and app data.)

17 Responses

  1. Myquel Grant says:

    Hi 😀

  2. DropR6 says:

    I need to pay to get the downlaode

  3. Asif Shafi says:

    Hey Max, If possible can you make a video on potential fixes for the Odin Error SW REV Check Fail (BootLoader) Device 2, Binary 1 and also subsequent error messages like Kernel Rev Check,

    My S9+ Has been stuck like this for 2 days, any help will be much appreciated

  4. khalil says:

    did all those steps and odin is stuck here:

    nothing happens i waited like 30 minutes, help.. i cant use my phone

  5. Boba says:

    I still have not managed to get it unrooted since my S9 just freezes with Magisk on it, but a warning. Forget about the link to get the original firmware. is horrible and wants you to pay a subscription in order to download any files…look somewhere else. I am still searching…

  6. Flemming says:

    Thanks for your fine description.
    However my S9 is stuck in Recovery.img, when I flash.

    Help please 🙂

  7. Lee says:

    Hi, thanks for the information but I went through restoring to stock firmware which completed successfully buut when I reboot the phone it’s now stuck in a loop of blue screen saying installing system update a a second or 2 and then reboots back to installing system update. I can’t turn the phone off and I cant get back into download mode either. All I can do is force reboot (Vol down and power) but that just reboots the phone back into installing system update. Any advise would be greatly appreciated Thanks

  8. Tom Reames says:

    Enter CS for MD5..
    Check MD5.. Do not unplug the cable..
    Please wait..
    Checking MD5 finished Sucessfully..
    Leave CS..
    Enter CS for MD5..
    Check MD5.. Do not unplug the cable..
    Please wait..
    Checking MD5 finished Sucessfully..
    Leave CS..
    Enter CS for MD5..
    Check MD5.. Do not unplug the cable..
    Please wait..
    Checking MD5 finished Sucessfully..
    Leave CS..
    Odin engine v(ID:3.1301)..
    File analysis..
    Total Binary size: 6348 M
    All threads completed. (succeed 0 / failed 1)

  9. Philip says:

    The memory went from 64 GB to 32 GB after doing this on my S9 plus

    • esnafru says:

      the same happened to me. I have the international dual sim version SM-G965F

      I didn’t know what version of firmware to download so I downloaded the USA version of the firmware and got the internal memory to 32GB.

      then I noticed in the box where the cell came new that it said manufactured in Vietnam. so I downloaded the vietnam version of the firmware and them got the 64GB back.

      so is just matter of installing the right version of the firmware

  10. zerzokt says:

    can you use samsung pass aufter the unroot

  11. Giorgio says:

    I have the knox warranty status at 0x1. Some samsung apps ae giving me rooting detection message.
    But the dvice is not rooted at the moment. I just flash the official ROm from SamMobile but I get same message.
    Please How can I do!?? even Samsung internet dont let me open a simple secret mode tab. Samsung Pass as well do not work…
    Can I hide this status? or how can I fully hard reset my device??
    Please help me out.
    Giorgio with a SM-G965F/DS…

  12. Nic says:

    I have rooted my S9 but would like to restore/unroot so I managed to get a new firmware via Odin. But the OEM remains open. How can I close it? Downloaded ADB / Fastboot ? But I dont understand all commands there…

  13. ziedXXL says:

    When doing this, Samsung pay will work ?

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Max Lee

Max Lee is the founder of Max makes Android tutorials and review videos for people who want to get high on Android over at his YouTube channel and Korean YouTube channel.