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

[robbo1947]

if i revert to stock rom after root and samsung status says official and relock bootloader will be able to get otas again???

Over the air update functionality is restored upon relocking the bootloader.

 

[VITHOR3E]

This method is right

 

[adzo73]

Is there somewhere other than samsmobile to get latest firmware for S10plus exynos beceause for some reason its impossible for me to download fr o m there and its not the first time I've encountered this problem there and this time i desperately need genuine firmware to lock etc as i need to hand phone back to samsung.thanks to anyone taking time to read this..

 

[robbo1947]

Is there somewhere other than samsmobile to get latest firmware for S10plus exynos beceause for some reason its impossible for me to download fr o m there and its not the first time I've encountered this problem there and this time i desperately need genuine firmware to lock etc as i need to hand phone back to samsung.thanks to anyone taking time to read this..

Have you tried Frija?
https://forum.xda-developers.com/ga...ija-samsung-firmware-downloader-t3910584/amp/

 

[thiefxhunter]

This method, works to make Spay working again ?

 

[robbo1947]

This method, works to make Spay working again ?

Only if you haven't rooted or installed other roms.
If you rooted, Knox which seems to be hardware based will still remain tripped.

 

[thiefxhunter]

Thanks for the info

 

[Tayyab Sohail]

Lock bootloader

Bro i tried this method but my phone show only download mode and show failure message
If i will go to settings then turn off oem and again follow your method.will this work

 

[robbo1947]

Bro i tried this method but my phone show only download mode and show failure message
If i will go to settings then turn off oem and again follow your method.will this work

If you want to lock bootloader the OEM needs to be off (to the left)
If you want to unlock the OEM needs to be on (to the right)

 

[zyndata]

@robbo1947 Thanks, working 100%

 

[ShahbazParviez]

Need some confirmation

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:

As far I know KNOX is a physical fuse bit in memory and can't reverse once tripped. So, my question basically is "Samsung apps like s health, dex, s pay, secure folder will work after re-locking the boot-loader and flashing stock ROM?1"

 

[SamarSS123]

Plz someone help, I have my Samsung A10 rooted and bootloader unlocked everything was going right but today I accidentally turned off oem unlock . I immediately closed everything and re-open developer option and oem unlock was turned off I again turned it on now I am in fear that does my phone bootloader automatically locked or I can safely reboot my device

 

[mastermindthunder]

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!!!

it was for me volume up + down then plug type-c cable