How to Safely Unroot Galaxy S6 & S6 Edge, Restore back to Stock and able to get an OTA software update again

Here’s how to safely unroot the Samsung Galaxy S6 and Galaxy S6 Edge and then restore it back to its official stock firmware. If you have a rooted Galaxy S6 there is a tendency and may cause the latest Firmware Over-The-Air (OTA) update to fail and sending you an error message that say something like “The operating system on your device has been modified in an unauthorized way. Try downloading software updates using Smart Switch on your computer or visit a customer service center.”

Sometimes it will also cause soft-bricks such as bootloop, the phone keeps restarting and won’t pass the Samsung welcome screen, the phone froze and stuck at Samsung and carrier logo and other problems. So that means if you want to stay out of trouble when you want to get the latest firmware version you must fully remove root and unroot your Galaxy S6 first. To unroot the Galaxy S6 is easy on some part but keep in mind that there are some safety procedures that you may need to consider before you unroot the Galaxy S6 so it won’t end up into undesirable outcomes.

This Galaxy S6 how to unroot guide covers on the following variants; such as the international Galaxy S6 SM-G920F, T-Mobile Galaxy S6 SM-G920T, Sprint Galaxy S6 SM-G920V, Canadian Galaxy S6 SM-G920W8 from Bell, Rogers, Telus and other carriers, Galaxy S6 SM-G920I version from Australia, Singapore, India & Latin America. I only covered the mentioned Samsung Galaxy S6 variants since these devices can be easily rooted. This does not include and cannot be applied on Verizon Galaxy S6 SM-G920V and AT&T Galaxy S6 SM-G920A since these variants are mostly has a locked bootloader. So I set aside and separate the unroot guides for the two.

If your Samsung Galaxy S6 is rooted with “CF-Auto Root” and have had a SuperSU installed. Right after CF-Auto Root installation it is actually already have the ‘SuperSU’ app installed in the device. The good thing is; CF-Auto Root also built with an option to permanently remove root in the app itself. So if you just simply want to remove root then follow these steps.

To activate the “SuperSU” unroot option just follow these steps:

  1. From Home screen, tap Apps then find the SuperSu app .
  2. Once in SuperSU screen, tap the Settings tab.
  3. Scroll down and locate option labeled Full unroot. A warning message will then pop-up, just tap on the Continue button.
  4. Wait until it says uninstalling root and then the phone automatically reboots. You can also manually restart the phone by pressing the Power button for about 10 seconds.

However, the process above does technically removed the root or the superuser access to the device but it doesn’t mean that it is safe now to run and perform the “OTA Software Update” again. Yes, the Galaxy S6 is unrooted at this stage but the device status still set into custom. This means the device still in modified status and the software update cannot get through when and if we tried to perform Software update it will still says “The operating system on your device has been modified in an unauthorized way. Try downloading software updates using Smart Switch on your computer or visit a customer service center.” So the best way to unroot your Galaxy S6 is by restoring back its custom status to official. Doing so you will get the latest Software update again without any difficulties. This method will wipe out any modification you have made in your Galaxy S6, even you do have custom recovery and modified kernels installed.

Here’s what it looks like on a modified Galaxy S6 status of which can be viewed in the device “Download mode” screen.

Product name: SM-G920F
 Current BINARY: Custom
 System Status: Custom
 Reactivation LOCK: OFF
 CROM SERVICE: Unlock
 Secure Download: Disabled
 KNOX WARRANTY VOID: 1 (0x5000)
 RP SWREV: 1
 Kernel RP SWREV: 1

Anyway, to access the Galaxy S6 in download mode, you may just press the (Volume Down, Home and Power button) then followed by pressing the (Volume Up) button. As long as your Galaxy S6 shows that information you won’t be able to get the official software update again. You must need to reset that system status from custom to official so that the Software update can get through without any hiccups, such as this;

Product name: SM-G920F
Current BINARY: Samsung official
System Status: Official
Reactivation LOCK: OFF
CROM SERVICE: Unlock
Secure Download: Disabled
KNOX WARRANTY VOID: 1 (0x5000)
RP SWREV: 1
Kernel RP SWREV: 1

So, how to safely unroot Samsung Galaxy S6 and might as well also restore back to official status?
There are two effective method to unroot the Samsung Galaxy S6 either you may use the Smart Switch or by means of flashing back the official stock firmware directly into the device.

Unroot Samsung Galaxy S6 and restore back to official stock firmware using Smart Switch (First Method)

Using Samsung’s owned app called “Smart Switch” that allows Galaxy S6 users to back up and transfer files but it also capable for restoring the Galaxy S6 official firmware. The Smart Switch is the replacement of Samsung’s “Kies” that can be use on Galaxy S6 and latest Samsung Android devices. We are going to use the Smart switch apps that can be installed on both Windows and Mac computers. Though this method will work to unroot the Samsung Galaxy S6 but sometimes it will fail as depends how your Galaxy S6 being modified. But you may try this method first, unless we still have a the second method down below.

Download Smart Switch:

Smart Switch for PC and Mac

Run Smart Switch as administrator once installed in your computer . Then simply connect your Galaxy S6. Click “Backup” icon to back up your important data first and foremost such as Contacts, Messages, Call Log, Videos, Music, Photos, Application and etc.

Smart switch back up icon

Click on More… option, once the backup has made. Choose “Emergency software recovery and initialization.” in the drop-down.
Smart switch Emergency software recovery

Select “Software Update and Initialization” tab.
Smart switch Software update & initialization tab

Follow the on-screen instructions that ask you to proceed or cancel.
Then wait until it says Software update and Initialization are complete.
Smart switch Software update initialization complete

Once your Galaxy S6 reboots disconnect and disconnect the USB data cable. Then lastly restore the previously back-up files by clicking the “Restore” icon.

However, if the Smart Switch method fail , you can try the second method below. The process is something similar to the above equation but this time around we are going to forcefully and directly install back the official firmware on our Galaxy S6.

Fully Unroot Samsung Galaxy S6 and Galaxy S6 Edge by Restoring back the Original and Official Stock firmware

This has been a proven method to fully remove root and any modification that has been made into the Galaxy S6 or Galaxy S6 edge. No matter it runs on any non-official firmware build, custom recovery and custom kernel it will all cleaned-up using this process.

Read the Safety Guidelines: How to Install Galaxy S6, S6 Edge & S6 edge+ Stock Firmware


105 thoughts on “How to Safely Unroot Galaxy S6 & S6 Edge, Restore back to Stock and able to get an OTA software update again”

  1. Good evening Sir, I have a huge problem with my phone. I have an international SM-G20F which is a galaxy s6. I installed a custom galaxy s6 rom and it changed to a galaxy s6 edge. so i want to install the stock s6 rom so should i flash the s6 or s6 edge stock rom? MY PHONE IS AN S6 NOT AN S6 EDGE

  2. can you help me i fail my root and now my screen is not working and when i put on my phone there is reading kernel.. .can i fix that without buying new circuit card or new touchscreen? PLEASE HELP!!

    1. Reboot in download mode (volume Down+Power+Home) first, then connect to PC while the phone is set in download mode screen. If it says “USB Device not recognized”, try this-> Enter Dialer >*#0808# > Choose MTP+ADB button and click Ok.

    2. plx someone tell me from where iget original kernel for s6 920f for marshsmallow because in others kernel it show a touch problem when i click right side touch automatically it clicked lifet side touch. help me to solve the problem…….

  3. Hi guys, can someone explain to me what is kernel version? yesterday i bought a new galaxy s6 and when i turn it on i see kernel version on the left side of the screen..

    does it mean that the device is rooted??

    1. The original kernel version says something like (“3.10.61-000000 dpi@SWHD#### #1” – build date). You may also try to use a root checker apps from Play Store.

  4. hi there is a problem with my S6 920P Sprint, I delivered to root, everything was good until I didn’t want it to remove, I removed byzibox apk and su apk after that I rebooted and he hanged on ravines sprint, took an insertion for mine 920P and did by means of odin but at the end wrote a mistake help please

    1. Try to perform full wipe and data cache in recovery mode. Then reflash the stock firmware.. Odin will fail if your G920P has been updated to 5.1.1 but you mistakenly installed the 5.0.2.

  5. Please help me.

    I need to do this method so that I can send the phone to Samsung for an under warranty repair, but I can’t connect my phone to USB.

    How do I flash stock firmware and unroot using a different method?

    1. You must install Smart Switch for PC first so that your computer can recognize your phone. If ever Smart Switch has been installed, a mere possibility that the problem lies within your computer USB serial port and or the USB data cable itself. (1)Try to reboot your phone in download mode first (Press Volume Down+Home+Power) and then connect to your PC. (2) Try to use any other computer and USB data cable.

  6. HELP :)

    I gave my phone into a shop to to unlock (to use me o2 sim on a Vodafone handset)
    My android system is running at 27% and Android OS 20% on the battery usage.
    It also says software update failed due to “The operating system on your device has been modified in an unauthorized way. Try downloading software updates using Smart Switch on your computer or visit a customer service center.”

    Do I need to reboot?

  7. Hey.

    I would like to unroot my Samsung Galaxy S6 Edge, model number: SM-G925F
    It runs Android 5.1.1 and has kernel version G925FXXU3QOKD

    But I can’t find the right stock firmware?? Can you help me?

    Best regards, Jimmy

  8. I m using Galaxy S6 Edge (G9250) which is also showing the same msg (The operating system on your device has been modified in an unauthorized way. Try downloading software updates using Smart Switch on your computer or visit a customer service center).
    I bought this used handset and it was already in this condition. Root Checker says that this device is not properly rooted. Also I m unable to flash stock Firmware by above method as it is repeadtedly getting failed besides using it on 2 computers. plz help to restore my phone to stock ang get OTA updates.

    1. As long as the phone has no physical damage, and is under warranty you may have the hang fixed by Samsung. They really are not that concerned about rooted devices as long as you aren’t trying to get a replacement.

  9. hey
    i rooted my samgung s6 edge yesterday and tried to make some in app purchases on a game, it didnt work. i tried different suggestions from online, deleting host file etc. to no avail. i then tried to delete play store, afterwards recieving pop up messages saying hangouts will not work properly and the process.com has stopped. so i tried to factory reset my phone using recovery mode, now when i restart the phone im stuck on the getting started section on checking connection screen and still have the pop ups appearing. i’m now trying to factory stock reset my phone, the recovery mode screen shows that the version of the phone is G920TUEU3COK1 this version isnt showing on the stock firmware page. PLEASE HELP!!!

  10. i have rooted my s6 edge using odin and the kernel was change, but when its done, the private mode became disable. any idea for my problem? my s6 model SM G925F

  11. Quick question, so i have a G920I and i purchased it unlocked and i use it in the United States. does it matter which G920I software i flash? There are options for a bunch of countries i dont live in.

  12. My phone is stuck on galaxy s6 edge screen due to a fail custom software i tried to do i downloaded the stock firmware and i installed it using odin as shown but the problem is that my phone is still stuck on that screen i tried the wipe/data factory in recovery mode but it didn’t work !!!
    PLEASE HELP !!

  13. My samsung S6 is stuck on a blue screen stating that an error occurred during software update and to use the emergency recovery function on smart switch. When i plug into pc smart switch states its unsupported. How do i know the build number etc if i can’t use my phone. All I can do is go between this screen and the download mode. My phone was bought unlocked in UK. Any ideas?

  14. Hi guys..I have galaxy s6 g920F.I had roooted my phone via CF.AUTOROOT.Rooting was done successfully.After some days i wanted to unroot my phone.So i went into supersu>settings>unroot and clicked this option.After 2 or 3 seconds my phone started to reboot.Phone was rebooting again and again.I waited till 30 minutes and then tried to fix this rebboting loop.I opened recovery mode and TWRP recovery opened.I wiped cache data and delvik cache then rebooted again.But problem was still there.Then I power down the phone for 2 or 3 inutes and restarted.This I was stuck on “Samsung Galaxy S6 powered by android”.now nothing is happening just stunck on this welcome screen.Tried to go into recovery and download mode nothing happen.Only one thing happens that when i try to go into download mode screen turns off and lights up again with welcome screen and stops there…..Guys lease help me

  15. Hello,

    I own a SM-G920F that right now has black screen (screen of death). If a press Volu Down + Power does not work..still black screen when reset. I can’t turn it off due that can see any selection on screen.
    I’m trying to do a firmware reinitialization thru smartSwith but when I try the “Software Update and Initialization” smartSwith display “sm-920f DOES NOT SUPPORT INITIALIZAING”. I’m stuck. don’t know what to do. Any hint?

    Thanks

  16. Just wanted to thank you… I had someone unlock my phone so I could use it in a different country and from then on could not update software. Thanks to this instructions I could fix the problem myself without any programming skills. I did’t even know what “rooting” meant! :) THANKS!

  17. Hi I bought a galaxy s6 cheap thinking I could fix it and it has proven to be harder then I thought it only turns on when plugged in once on its stuck on the galaxy s6 screen and in the top left corner it says recovery is not seandroid enforcing the only other thing I can do with it is go into download mode it won’t go into recovery mode and since I purchased it this way I can’t look up the serial number or build number or none of that please help me

    1. In download mode you can see your Galaxy S6 model number (look for the Product name: SM-G920x). You can flash any latest stock firmware build though, either from other countries specific stock firmware build. Just ensure that firmware you’ve choose will match your Galaxy S6 model number.

  18. i updated to 5.1.1 on my SM-G925F LMY47X.G925FXXU3C0J1 what would i be able to do, im getting the kernal seanforced error. thanks in advance.

  19. my phone is stuck in the logo after failed in rooting and i also couldn’t off my phone. How can i do to revive my phone back. my phone model is sm-g920s. And how to flash back to the original firmware.

    1. Try to perform Wipe data/factory reset in recovery mode. Press and hold the Power+Home+Volume up at the same time. Once you get in recovery mode screen, choose reset.

  20. Can u help me my mum sent me a 2nd hand phone I found out it had a custom firmware .
    I’m not sure why but I’m afraid it’s done to sim unlock
    If I follow these instructions ando get the official firmware well my phone sim lock again ?
    Coz my build number is a Vodafone
    Please waiting for ur replay

  21. Phone Model: SM-G925F
    Bootlader Version: G925FXXU3COI9
    PDA Version: G925FXXU3COI9
    CSC Version: G925FXXU3COK1
    Original CSC Code: XME
    Firmware’s CSC COde: BTU
    Active CSC Code: XME/ BTU
    CSC Country: UK & IRE/GB
    Country of Origin: MADE IN VIETNAM

    What file should i download?

  22. i rooted my s6 edge but forgot about closing Reactivation Lock now its in a BOOT LOOP i have tried wiping all data , factory reset , nothing is working please help.

  23. My samsung S6 is stuck on a blue screen stating that an error occurred during software update and to use the emergency recovery function on smart switch. When i plug into pc smart switch states its unsupported. How do i know the build number etc if i can’t use my phone. All I can do is go between this screen and the download mode. My phone was bought unlocked in UK. Any ideas?

  24. Hi, I have an S6 edge SM-G925V, I was installing the lastest firmware G925VVRU4BOK7 but since my phone stucked at Samsung logo. I can’t go further. I have tried to fix it first with smart switch then with wipe/cache partition-data factory reset-reboot system now but it didn’t work.

    I need a solution and help!!!

  25. I need help! I can’t find my model number on the website where I download the stock firmware off and when I try the first option using smart switch I get the error message on my computer saying that my device model doesnt support Software update and Initialization. What do I do now because I want to download the new 6.0.1 update and I cant with a custom kernel.

    Thanks in advance

  26. I flashed the stock firmware over to the phone with success but I am no longer able to make or receive phone calls or text messages although the data worked somehow. I’m not sure what the issue is. Has anyone else experienced this? I hope there is a solution.

    1. *Update* After troubleshooting with a verizon rep, she placed her sim card in my phone (also an s6) and was able to make a call. I then had to purchase a new sim and it worked. Maybe this will help someone in the future.

  27. Hi,
    I have Galaxy S6 G920F, After flashing Stock rom 5.1.1 through Odin, it stuck on Samsung Logo, I even wiped cache and reset, but no use. And then flashed an custom kernal and now my phone is working but its rooted. How can I get back to unroot.? Please help.

  28. You mentioned that this will not work on the Sprint Galaxy S6 SM-G920P. What do I need to do to restore my Sprint Galaxy S6 SM-G920P. Thanks in advance.

  29. Hi!

    I have two questions:

    1) It is mentioned above that you deal with G920P (Sprint) in another article, separately. Where can I find the description for unrooting this device?

    2) I cannot find a ‘Reactivation LOCK’, and I have no ‘Security’ option under Settings. Is this normal? Will it be a problem after flashing?

    Thanks a bunch

    1. Same method as above but you may need to grab Sprint S5 specific stock firmware. — Marshmallow builds = G920PVPS3CPD2, G920PVPU3CPB6. Lollipop builds = G920PVPU3BOL1, G920PVPU3BOJ7, etc..
      The ‘Reactivation LOCK’, OEM lock doesn’t matter at all as long as you can flash the stock firmware.

  30. I have Galaxy S6 SM-920P it is running lollipop 5.1.1, but once I updated it to Marshmallow via OTA then it stops supporting my SIM, so I have to get it revert to lollipop 5.1.1.

    My phone downloaded again marshmallow via OTA, but I am not installing the update due to above stated problem.

    Can anyone help me?

  31. Please help i have a s6 edge g925v im getting a drk error after trying to update to marshmallow but now drk file is missing. Please help. I need drk files or kernel recovery anything please.

  32. Hi there,

    I bought used Samsung Galaxy S-6 edge from online. Yesterday I went to Samsung shop to upgrade from Lollipop to Marshmellow version; they couldn’t do it because my phone had CUSTOM ROM rather than original Samsung built in software.

    I have nothing related to Original samsung software with me. Can someone PLEASE help me how to restore my phone’s original setting.

    May GOD bless you!
    Thanks in advance!

  33. My samsung S6 is stuck on a blue screen stating that an error occurred during software update and to use the emergency recovery function on smart switch. When i plug into pc smart switch states its unsupported. How do i know the build number etc if i can’t use my phone. All I can do is go between this screen and the download mode. how can I fix this problem

    1. That problem isn’t new and you’re not alone. You may send it back to your dealer, they will fix it for you by means of flashing the stock firmware.

  34. Hi there, I bought a used Galaxy s6, and when I checked through Samsung+ it said rooted device. When I check the device in download mode (Odin mode) it says sm – 920t but from about phone it says sm-920f. What can I do to upgrade from lollipop to marshmallow? I couldn’t find the right software from this website. Please, help me. Thanks in advance.

  35. I have tried Method 2 and keep on getting failed. Is there anyway to resolve this? Please contact me via email.
    I have a samsung s6 edge SM-G925F. many thanks

  36. Hey.

    I would like to unroot my Samsung Galaxy S6 Edge, and bringing my to its official status
    model number: SM-G925F
    It runs Android 5.1.1 and has kernel version G925FXXU3COJ1

    But I can’t find the right stock firmware?? Can you help me?

    Best regards, Fayaz

  37. hi boss i have s6 butt littel problem recover show model sm-g920p and firmwer model sm-g920f how can update 6.0..p;z help me

  38. What if my S6 is not rooted ever since. Just want to downgrade feo 6.0.1 to 5.0.1.. Can I use the same procedure as mentioned? Tnx and God bless.

  39. i flash my s6 edge stock rom nd den i flash twrp recovery nd try to install supersu but after install supersu ints not booting after showing samsung galaxy s6 edge boot loop problm Any solustion?

  40. I m using Galaxy S6 Edge (G925F)
    I bought this used handset and it was already in this condition. Root Checker says that this device is not properly rooted. Also I want to have original softwer in my phone. Yes I war reading you article about unroot galaxy s6 EDGE. But I saw that many people have a problem about unrooting . I have AP: G925FXXU3COI9 CSC: G925FXXU3COI9… In sammobile i found that AP and CSC suit Serbian mobile network VIP. I downloaded that . Would I having a problems when returning to the original software because they do not know how it is rooted phone?

  41. Hi, my phone has been rooted and recently something has gone wrong. i was asked to update SuperSu Ai which i did but after updating my phone keeps rebooting to TWRP. i can get my phone into download mode but other than that only TWRP. Is there any way of fixing this? Any help appreciated, don’t know how to go about solving this.

    Thanks

  42. hi respecteds ,
    recentrly i got samsung s6 edge and i think it is rooted. when i wish to update to marshmallow it shows a window ,
    “The operating system on your device has been modified in an unauthorised way. Try downloading software updates using Smart Switch on your computer or visit a customer service center.”
    but now i come to know how to unroot and install a firmfare update about my galaxy s6 edge….. my question is, just tell me , is it appear any problems or demage my phone when unroot ? or is it totally safe with odin ?
    Thanks

  43. Hi i bought my phone from friend my phone is s6 but shows it s6edge it rooted and i have SuperSu and they have blocked some things on the phone how to unroote it pls help!!?!

  44. Hi, I did all the steps, worked to perfection, but ended up stuck in welcome screen. I can’t turn it off, and cant enter recovery mode. Any suggestions?

  45. THANK YOU! This was the only guide that I have found in about a month that actually restored my Samsung Galaxy S6 Edge back to factory status. The Smart Switch procedure was what worked for me after countless fails through Odin.

  46. I have s6 edge plus sm928t.I upgrade it to 5.1.1 to marshmallow but now have many issues like messenger connecting disconnecting.I update it to smart switch but now I want to downgrade again to 5.1.1 lollipop show me a way to fix it.

  47. Hi, would this restore access to KNOX on my Samsung S6 device? It’s unbelievable that I can’t get access to corporate email because I once may have downloaded something outside of the play store. Is there a way for me to get KNOX back on my phone?

  48. Hi, a few days ago saw that my phone turned off and I notice that is stuck on the “Samsung Galaxy s6 edge+” logo (but the logo looks smudge) and it turns on and off with only the logo on the screen….
    I tried to go in to Recovery mode, but it doesn’t work.
    I’m able to access the screen for ODIN, but even this has a few smudges
    “Volume Down for Restart, power & menu button”
    But when I installed the new firmware, nothing. Same issue with the logo, on and off
    please help….

  49. My husband just did a system update for his galaxy 6 edge and his phone is now “bricked” or stuck on the blue “screen of death” as a few of his coworkers are calling it. The phone is only a year and change old, so how can this even happen? He tried to do a manual reset and nothing. Then he tried to do a factory reset, lost EVERYTHING on his phone, which REALLY upset him and still NOTHING. HOW DO WE GET THIS FIXED?!?!?!?!?!

    1. That issues isn’t new at all, it happened long before and it’s still happening to many. You can take the phone to your nearest service center, and tell them everything how’d things happened. They knew about it, and they’ll surely fix it free of charge.

  50. Hi,
    I bought a used Samsung S6 Edge SM-G925F from the market and I was making some searches about it but I realized that it is rooted because it doesn’t take updates and it has a very old Firmware (5.1.1). I was going to unroot it when I also realized that the IMEI I was searching is a AT&T one and it shows on the web that the phone is a S6 not a S6 Edge and also shows that the phone is blacklisted. I wanted to know how is this possible and what can I do to have a clean phone because I’m afraid that if I unroot it the phone will die. Is there any option to save my phone.

  51. my new samsung galaxy s6 edge turns off randomly and restarts by its self. I have tried updating the phone to the latest version but it wont stop. it also writes your device has been modified in unauthorized way. i cant even use the phone as it keeps on restarting randomly. Please what can i do?

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