[GUIDE] Re-Lock Bootloader Galaxy s10|s10+|s10e

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chalofito

Senior Member
Apr 18, 2014
1,066
428
Veracruz
I was thinking of a way to block the bootloader, and I came up with something very basic, so please who can try the method, share whether it works or not. (This method was checked and it WORKS !!)
Warning: I am not a super developer, just one more user who wants to help the community
Warning 2: This Process will erase everything in its path, remember to make a backup of your internal memory.
This series of steps is aimed at inexperienced users, if you think you are missing or there are many steps, this guide is not for you.
Without more to say, let's start.

How to re-lock bootloader:
1. Turn off your device.
2. Press Bixby Volume down and connect your device to a PC to start the download mode (now you can release both buttons)
3. Read the text below on the Download Mode screen
to block or unblock the Bootloader.
4.- Long press the vol (- or +) button as best suits you.
LOCK BOOTLOADER:
5. Long press the volume up button ( ) until the computer is restarted (this will erase your data and restart automatically). :fingers-crossed:
Ready! Now you have a device with an OEM lock.

Good luck my friends!!! :D
 

akkaria

Member
Jun 13, 2017
24
7
I was thinking of a way to block the bootloader, and I came up with something very basic, so please who can try the method, share whether it works or not. (This method was checked and it WORKS !!)
Warning: I am not a super developer, just one more user who wants to help the community
Warning 2: This Process will erase everything in its path, remember to make a backup of your internal memory.
This series of steps is aimed at inexperienced users, if you think you are missing or there are many steps, this guide is not for you.
Without more to say, let's start.

How to re-lock bootloader:
1. Turn off your device.
2. Press Bixby Volume down and connect your device to a PC to start the download mode (now you can release both buttons)
3. Read the text below on the Download Mode screen
to block or unblock the Bootloader.
4.- Long press the vol (- or +) button as best suits you.
LOCK BOOTLOADER:
5. Long press the volume up button ( ) until the computer is restarted (this will erase your data and restart automatically). :fingers-crossed:
Ready! Now you have a device with an OEM lock.

Good luck my friends!!! :D

Thank you for posting this. I've had this method work once before but i am in a bit of a pickle at the moment.

I no longer get the options to 'long press vol up' which i think is the key to re locking the bootloader. Have you or anyone else got any idea why that would be?
 

chalofito

Senior Member
Apr 18, 2014
1,066
428
Veracruz
Thank you for posting this. I've had this method work once before but i am in a bit of a pickle at the moment.

I no longer get the options to 'long press vol up' which i think is the key to re locking the bootloader. Have you or anyone else got any idea why that would be?


This was tested once and it worked, it was not tried for the second time .. What version of Compilation do you have?
 

SakazukiAka

Member
May 18, 2019
22
4
Thanks for your help. Yes, hopefully soon someone will find a method.

Can you tell what exactly you already did with your phone? Did you unlock bootloader, re lock bootloader, then unlocked it again and then actually rooted it? And now after you unrooted your phone you can not re lock bootloader?
I am asking because I suspect that you can not re lock you bootloader again after you actually have rooted your phone once. I am suspecting I only read a post from a guy who managed to re lock is bootloader but he never actually rooted his phone once. So in other words after you tripped knox (which seems to only happen when you install magisk) you may not be able to re lock you bootloader (ever) again.
 

akkaria

Member
Jun 13, 2017
24
7
Can you tell what exactly you already did with your phone? Did you unlock bootloader, re lock bootloader, then unlocked it again and then actually rooted it? And now after you unrooted your phone you can not re lock bootloader?
I am asking because I suspect that you can not re lock you bootloader again after you actually have rooted your phone once. I am suspecting I only read a post from a guy who managed to re lock is bootloader but he never actually rooted his phone once. So in other words after you tripped knox (which seems to only happen when you install magisk) you may not be able to re lock you bootloader (ever) again.

Yes!! You hit the nail on the head!! So i was able to re lock bootloader once before but i wasnt successful in rooting the phone. After i then successfully rooted the phone with Magisk i restored back to normal and no i cannot re lock the bootloader.

It seems as though a few people have said you can't re lock it after successfully rooting! Quite frustrating!!
 

SakazukiAka

Member
May 18, 2019
22
4
Yes!! You hit the nail on the head!! So i was able to re lock bootloader once before but i wasnt successful in rooting the phone. After i then successfully rooted the phone with Magisk i restored back to normal and no i cannot re lock the bootloader.

It seems as though a few people have said you can't re lock it after successfully rooting! Quite frustrating!!

I see. There is another method, that seems to work, tested by @robbo1947 that he explained here.
Assuming you had the standard Samsung ROM (you hadn't flashed a custom ROM)
Change OEM switch while rooted, exit settings, no need to flash stock firmware.
Power off phone.
Press and hold Bixby and Volume down, whilst holding connect with USB cable to computer. Release buttons when Download screen appears.
Long press the Volume up.
At this stage, the phone will wipe the data and overwrite the Magisk modification then reboot.
You should now have an S10, standard boot screens, stock ROM and no root.
I did not check it myselff yet, but it worked for robbo1947. All credits goes to @robbo1947 !! Please let us know if that worked for you or not.
 
Last edited:

robbo1947

Senior Member
Jun 2, 2007
424
277
Manchester
I see. There is another method, that seems to work, tested by @robbo1947 that he explained here.

I did not check it myselff yet, but it worked for robbo1947. All credits goes to @robbo1947 !! Please let us know if that worked for you or not.

I am going to have a go again in the next few days to prove to myself and others that it is possible to relock the bootloader after rooting. Will let you know.
Watch this space.
 
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akkaria

Member
Jun 13, 2017
24
7
I am going to have a go again in the next few days to prove to myself and others that it is possible to relock the bootloader after rooting. Will let you know.
Watch this space.

I look forward to your findings. As i am running my phone as my daily driver now i am hesitant to re root it if this method wont work. I have my fingers crossed though :)
 

Lebrun213

Senior Member
Jun 27, 2018
73
25
samsung doesn't allow you to unlock and then lock back the device multiple times. It only works once, then your bootloader stay unlocked for ever.
 

drago122

Senior Member
Dec 26, 2014
95
13
I I had root and twrp on my s10 + but I quietly put the last nobrand ASE7 firmware back and I re-locked the bootloader without any difficulty I no longer have any warning messages at startup and in the developer options I have the oem option working like new.
 

robbo1947

Senior Member
Jun 2, 2007
424
277
Manchester
I look forward to your findings. As i am running my phone as my daily driver now i am hesitant to re root it if this method wont work. I have my fingers crossed though :)

samsung doesn't allow you to unlock and then lock back the device multiple times. It only works once, then your bootloader stay unlocked for ever.

OK, sorry for delay in getting back to this question of locking and unlocking the bootloader on the Galaxy S10.
During the last few days I have locked, unlocked, locked and unlocked again, probably 15 or 20 times to test various scenarios.
Please remember, each time you lock or unlock the bootloader all of your data is wiped.. any Root will also be gone. You will also be needing your current firmware.
This is for the Galaxy S10 without TWRP.

Scenario 1. Your phone is rooted with Magisk.
Go into Developers options and check OEM options, the switch must be ON (to the right). If it isn't turn it ON.
Turn off your phone. Press and hold the Bixby and Volume-down button, then connect with USB to your computer. (The cable shouldn't be connected until after you press the buttons).
Within seconds of USB connection the Download screen will appear. You will see 3 optiions, choose and Long press volume up and hold button until you see the 2 options at bottom of screen. Choose and hold volume up until screen goes off. Then the S10 logo screen will briefly apppear, before it flicks back to the Download screen with the words 'VBMETA: Error verifying vbmeta image etc' at the top, as the image below.
This is all good so far. Leave the phone exactly as it is with this screen showing and make sure the phone is still connected to the computer.
On your computer, fire up Odin3_v3.13.1, you can leave the Reboot option in Odin ticked. Locate your firmware on your computer and put the 4 file parts (BL, AP. CP and CSC) into Odin.
Let Odin finish.
The phone will reboot ready for setup.
The Unlocked bootloader warning screen will be gone.


Scenario 2. Your phone has been rooted but isn't now, and the greyed out OEM switch is ON
Easy, turn off your phone and proceed from the 2nd paragraph of Scenario 1.


Scenario 3 Your phone has been rooted but isn't now, and the greyed out OEM switch is OFF
Sorry, but in this situation, you are going to have to root your phone with Magisk as the OEM switch will only be available when rooted.
When rooted, proceed as Scenario 1.


Scenario 4 Your phone has never been rooted, and the greyed out OEM switch is ON i.e. you unlocked the bootloader but never proceeded to root the phone
Turn off your phone and proceed from the 2nd paragraph of Scenario 1.

If you want proof that I have locked and unlocked time and time again see HERE


:victory:
 
Last edited:

akkaria

Member
Jun 13, 2017
24
7
OK, sorry for delay in getting back to this question of locking and unlocking the bootloader on the Galaxy S10.
During the last few days I have locked, unlocked, locked and unlocked again, probably 15 or 20 times to test various scenarios.
Please remember, each time you lock or unlock the bootloader all of your data is wiped.
. any Root will also be gone. You will also be needing your current firmware.

Scenario 1. Your phone is rooted with Magisk.
Go into Developers options and check OEM options, the switch must be ON (to the right). If it isn't turn it ON.

Turn off your phone. Press and hold the Bixby and Volume-down button, then connect with USB to your computer. (The cable shouldn't be connected until after you press the buttons).
Within seconds of USB connection the Download screen will appear. You will see 3 optiions, choose and Long press volume up and hold button until you see the 2 options at bottom of screen. Choose and hold volume up until screen goes off. The S10 logo screen will briefly apppear, before it flicks back to the Download screen as the image below.
With the phone still connected to your computer, fire up Odin3_v3.13.1, you can leave the Reboot option in Odin ticked. Locate your firmware on your computer and put the 4 parts into Odin.
Let Odin finish. The phone will reboot and the Unlocked bootloader warning screen will be gone.


Scenario 2. Your phone has been rooted but isn't now, and the greyed out OEM switch is ON
Easy, turn off your phone and proceed from the 2nd paragraph of Scenario 1.


Scenario 3 Your phone has been rooted but isn't now, and the greyed out OEM switch is OFF
Sorry, but in this situation, you are going to have to root your phone with Magisk as the OEM switch will only be available when rooted.
When rooted, proceed as Scenario 1.


Scenario 4 Your phone has never been rooted, and the greyed out OEM switch is ON i.e. you unlocked the bootloader but never proceeded to root the phone
Turn off your phone and proceed from the 2nd paragraph of Scenario 1.

No dramas, thanks heaps for your reply.

So it seems I am in scenario 3 meaning I'll need to re root my phone which is fine. However, when I hold down the bixby and volume up and plug in I don't get the option to long hold volume up which I previously did. I only have press volume up or down. Is this because my bootloader is already unlocked? I should still be able to re root my phone in this scenario shouldnt i?
 

robbo1947

Senior Member
Jun 2, 2007
424
277
Manchester
No dramas, thanks heaps for your reply.

So it seems I am in scenario 3 meaning I'll need to re root my phone which is fine. However, when I hold down the bixby and volume up and plug in I don't get the option to long hold volume up which I previously did. I only have press volume up or down. Is this because my bootloader is already unlocked? I should still be able to re root my phone in this scenario shouldnt i?

Yep, your bootloader is unlocked.
When you have re-rooted and you go into Developer options you will be able to control the OEM switch and ensure it is ON.
Then when you get into Download mode you will see that option of LONG press Volume-up.
I've just added video proof to original post.
 
Last edited:
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akkaria

Member
Jun 13, 2017
24
7
Yep, your bootloader is unlocked.
When you have re-rooted and you go into Developer options you will be able to control the OEM switch and ensure it is ON.
Then when you get into Download mode you will see that option of LONG press Volume-up.
I've just added video proof to original post.

Awesome. Will give it a go in the next day or two and report back but given your success I'm hoping I'll have the same.
Cheers
 

akkaria

Member
Jun 13, 2017
24
7
Don't forget the :good:

You sir, are my hero. It all worked perfectly and i no longer get the bootloader warning screen and my bootloader is now relocked!!

For anyone else having this problem, i too can confirm that this method works. The only issue i had was that for some reason, i was stuck on the Samsung flashing boot screen for nearly half an hour. A simple reboot into recovery(hold power and volume down for 7 seconds to shut down and then quickly hold power, vol up and bixby) and wipe factory data then system reboot fixed it.

I can also confirm that after doing this and re locking the bootloader, i now have access to all apps that i was previously having issues with and my google play store recognises my devices as certified.

I now have a fully working and functional device. Thank you again.
 
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nikolas60

Senior Member
Apr 17, 2011
499
82
if i revert to stock rom after root and samsung status says official and relock bootloader will be able to get otas again???
 

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  • 7
    I was thinking of a way to block the bootloader, and I came up with something very basic, so please who can try the method, share whether it works or not. (This method was checked and it WORKS !!)
    Warning: I am not a super developer, just one more user who wants to help the community
    Warning 2: This Process will erase everything in its path, remember to make a backup of your internal memory.
    This series of steps is aimed at inexperienced users, if you think you are missing or there are many steps, this guide is not for you.
    Without more to say, let's start.

    How to re-lock bootloader:
    1. Turn off your device.
    2. Press Bixby Volume down and connect your device to a PC to start the download mode (now you can release both buttons)
    3. Read the text below on the Download Mode screen
    to block or unblock the Bootloader.
    4.- Long press the vol (- or +) button as best suits you.
    LOCK BOOTLOADER:
    5. Long press the volume up button ( ) until the computer is restarted (this will erase your data and restart automatically). :fingers-crossed:
    Ready! Now you have a device with an OEM lock.

    Good luck my friends!!! :D
    5
    I look forward to your findings. As i am running my phone as my daily driver now i am hesitant to re root it if this method wont work. I have my fingers crossed though :)

    samsung doesn't allow you to unlock and then lock back the device multiple times. It only works once, then your bootloader stay unlocked for ever.

    OK, sorry for delay in getting back to this question of locking and unlocking the bootloader on the Galaxy S10.
    During the last few days I have locked, unlocked, locked and unlocked again, probably 15 or 20 times to test various scenarios.
    Please remember, each time you lock or unlock the bootloader all of your data is wiped.. any Root will also be gone. You will also be needing your current firmware.
    This is for the Galaxy S10 without TWRP.

    Scenario 1. Your phone is rooted with Magisk.
    Go into Developers options and check OEM options, the switch must be ON (to the right). If it isn't turn it ON.
    Turn off your phone. Press and hold the Bixby and Volume-down button, then connect with USB to your computer. (The cable shouldn't be connected until after you press the buttons).
    Within seconds of USB connection the Download screen will appear. You will see 3 optiions, choose and Long press volume up and hold button until you see the 2 options at bottom of screen. Choose and hold volume up until screen goes off. Then the S10 logo screen will briefly apppear, before it flicks back to the Download screen with the words 'VBMETA: Error verifying vbmeta image etc' at the top, as the image below.
    This is all good so far. Leave the phone exactly as it is with this screen showing and make sure the phone is still connected to the computer.
    On your computer, fire up Odin3_v3.13.1, you can leave the Reboot option in Odin ticked. Locate your firmware on your computer and put the 4 file parts (BL, AP. CP and CSC) into Odin.
    Let Odin finish.
    The phone will reboot ready for setup.
    The Unlocked bootloader warning screen will be gone.


    Scenario 2. Your phone has been rooted but isn't now, and the greyed out OEM switch is ON
    Easy, turn off your phone and proceed from the 2nd paragraph of Scenario 1.


    Scenario 3 Your phone has been rooted but isn't now, and the greyed out OEM switch is OFF
    Sorry, but in this situation, you are going to have to root your phone with Magisk as the OEM switch will only be available when rooted.
    When rooted, proceed as Scenario 1.


    Scenario 4 Your phone has never been rooted, and the greyed out OEM switch is ON i.e. you unlocked the bootloader but never proceeded to root the phone
    Turn off your phone and proceed from the 2nd paragraph of Scenario 1.

    If you want proof that I have locked and unlocked time and time again see HERE


    :victory:
    2
    Awesome. Will give it a go in the next day or two and report back but given your success I'm hoping I'll have the same.
    Cheers

    Don't forget the :good:
    1
    I see. There is another method, that seems to work, tested by @robbo1947 that he explained here.

    I did not check it myselff yet, but it worked for robbo1947. All credits goes to @robbo1947 !! Please let us know if that worked for you or not.

    I am going to have a go again in the next few days to prove to myself and others that it is possible to relock the bootloader after rooting. Will let you know.
    Watch this space.
    1
    No dramas, thanks heaps for your reply.

    So it seems I am in scenario 3 meaning I'll need to re root my phone which is fine. However, when I hold down the bixby and volume up and plug in I don't get the option to long hold volume up which I previously did. I only have press volume up or down. Is this because my bootloader is already unlocked? I should still be able to re root my phone in this scenario shouldnt i?

    Yep, your bootloader is unlocked.
    When you have re-rooted and you go into Developer options you will be able to control the OEM switch and ensure it is ON.
    Then when you get into Download mode you will see that option of LONG press Volume-up.
    I've just added video proof to original post.