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How To Guide How To: Unlock Bootloader

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cldkrs

Senior Member
Dec 12, 2019
98
48
Geilenkirchen
How To Unlock Bootloader Galaxy A12.

Code:
*** Disclaimer
I am not responsible for any damage you made to your device
You have been warned


- Go to Settings -> About phone and find your build number.

- Tap on your build number 6 times until you see “You’re now a developer”.

- Go in Developer options > enable OEM unlocking.

- Shut Down your Phone

- Hold Vol + & Vol - and Connect the USB-C Cable

- Device will boot in DOWNLOAD MODE.

- Long press volume UP to unlock the bootloader.
( This will wipe your data and automatically reboot your device! )

- After Reboot the Bootloader is unlocked.
 
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jkaltes

Member
May 16, 2018
10
0
I have done exactly this and the Samsung A12 is now in a boot loop. I have already tried the following:
- Press the power button for a long time.
- Press vol-down+power and if it is turned off only power (https://www.naldotech.com/how-to-fix-bricked-samsung-galaxy-a12-stuck-in-bootloop/)
- Vol-down + vol-up and connect C-USB
- Some variations on this.

UPDATE:
When I tried Vol-down + vol-up and connect C-USB again, it worked and I unlocked the bootloader.
 
Last edited:
It’s how easy Samsung devices are OEM unlocked
1. Tap Build number 7 to 10 times ... You’re now a developer
2. Take software updates
3. Developer settings
4. Allowance of OEM unlocking
5. Start Heimdall (Odin) on desktop to tether your A12 thru USB-C
6. <Vol+> + <Vol-> to reboot to Download mode
7. Long press <Vol+> to unlock bootloader
 
Last edited:

crungtrusse

New member
May 26, 2021
1
1
Hi, I'm new to all this and hopefully I'm just missing something obvious. When I put my A12 into Download Mode, I have no option for a volume-up long-press, as seen in attached photo. I have an A125U model if that information is at all relevant. Developer mode is on, and OEM unlocking is enabled. Not sure where to go from here, any insight would be greatly appreciated!
firefox_2021-05-26_13-46-56.png
 
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bouyakasha

Member
Jan 23, 2008
34
3
Hi, I'm new to all this and hopefully I'm just missing something obvious. When I put my A12 into Download Mode, I have no option for a volume-up long-press, as seen in attached photo. I have an A125U model if that information is at all relevant. Developer mode is on, and OEM unlocking is enabled. Not sure where to go from here, any insight would be greatly appreciated!View attachment 5320891

I have the exact same problem.

OEM unlock is toggled ON in developer options.

I cannot get VolUP_VolDOWN + USB to computer to produce download mode so I can unlock my bootloader. All I get is the charging battery %.

Is there any solution to this?
 

rob420p

Senior Member
Dec 16, 2013
591
147
Bmore
OnePlus 7T
Samsung Galaxy A12
I have the exact same problem.

OEM unlock is toggled ON in developer options.

I cannot get VolUP_VolDOWN + USB to computer to produce download mode so I can unlock my bootloader. All I get is the charging battery %.

Is there any solution to this
Same issue tmoble is trying to tell me it automatically unlocked my boot when I Sim unlocked which I'm sure is not true it didn't wipe my data for one
 

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    How To Unlock Bootloader Galaxy A12.

    Code:
    *** Disclaimer
    I am not responsible for any damage you made to your device
    You have been warned


    - Go to Settings -> About phone and find your build number.

    - Tap on your build number 6 times until you see “You’re now a developer”.

    - Go in Developer options > enable OEM unlocking.

    - Shut Down your Phone

    - Hold Vol + & Vol - and Connect the USB-C Cable

    - Device will boot in DOWNLOAD MODE.

    - Long press volume UP to unlock the bootloader.
    ( This will wipe your data and automatically reboot your device! )

    - After Reboot the Bootloader is unlocked.
    1
    <Vol+> + <Vol-> + connect C-USB to reboot to Download mode
    1
    Hi, I'm new to all this and hopefully I'm just missing something obvious. When I put my A12 into Download Mode, I have no option for a volume-up long-press, as seen in attached photo. I have an A125U model if that information is at all relevant. Developer mode is on, and OEM unlocking is enabled. Not sure where to go from here, any insight would be greatly appreciated!
    firefox_2021-05-26_13-46-56.png