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How to Unlock Bootloader on Samsung Galaxy A51

In this guide, we will show you the steps to unlock the bootloader on your Samsung Galaxy A51 device. This offering from the South Korean Congloremate scaled the popularity charts in no time whatsoever. Its specs sheet also managed to grab everyone’s eyeballs. With an underlying octa-core Exynos 9611 chipset coupled with up to 8GB of RAM and Mali-G72 as the GPU, the performance front is well managed. Likewise, the quad rear camera supported by a single selfie camera managed to take some decent clicks.

Well, it even has an a3.5mm headphone jack, something that has now become a luxury! However, since it came with Exynos chipset, there were a few concerns on two different aspects. The first one is whether it would be able to on par with the Snapdragon chipset in terms of performance. Having a conversation on the same with a few A51 device owners, and they were pretty much satisfied with its everyday use. Now, the second query was mostly associated with tech enthusiasts.

There is always a notion that the custom development of devices with Exynos chips aren’t as active as Snapdragon or MediaTek. While this is true up to an extent, but fortunately, not with this device. The device is quite an active player in this domain, with a plethora of tweaks already available. If you wish to try them out, there is just one prerequisite that you need to check-mark- an unlocked bootloader. And in this guide, we will help you with just that. So without further ado, here are the steps to unlock the bootloader on your Samsung Galaxy A51 device.

Unlock Bootloader on Galaxy A51: Benefits and Risks

Unlocking your device’s bootloader will allow you to carry out a plethora of tweaks. You could flash various Custom ROMs, install Custom Recovery (like TWRP), try out tons of mods and hacks, and most importantly- root your device. The latter could be done via TWRP (flashing Magisk ZIP via TWRP) or without TWRP (by patching and flashing the stock boot. img). After you get administrative privileges, you could then try out a ton of Magisk ModulesXposed Framework, Substratum Themes, among others.

However, they do bring in a few uninvited risks as well. To begin with, it will trip the Knox counter of your device. This will straightway make your Samsung device’s warranty null and void. All the data on your device will be wiped off as well. Furthermore, all the apps that depend on this Knox will no longer function.

These include the likes of Samsung Pay and Secure Folder. Likewise, apps like Google Pay and Pokeom Go might no longer function. Netlfix Widevine L1 Certification will also be degraded to L3, as a result, you wouldn’t be able to watch videos in HD. With that said, if you are ready to proceed ahead, then here are the steps to unlock the bootloader on your Samsung Galaxy A 51.

How to Unlock Bootloader on Samsung Galaxy A51

Well, the OEM had already put in a few stringent measures in the form of Prenormal RMM State and DEFEX. Add to it the New Vaultkeeper mechanism, and things turned out to be quite complicated. Fortunately, its fix is relatively simple and we have shared that below. Before this mechanism was introduced, you only had to enable a toggle and your job was done. However, now you will have to execute a few extra efforts as well.

Thankfully, they are easy to do and takes only a few seconds. So on that note, let’s begin the guide to unlock the bootloader on Samsung Galaxy A51. Do keep in mind that the below steps will wipe off all the data from your device, so take a backup beforehand. Droidwin and its members wouldn’t be held responsible in case of a thermonuclear war, your alarm doesn’t wake you up, or if anything happens to your device and data by performing the below steps.

STEP 1: Enable USB Debugging on Samsung Galaxy A51


  1. To begin with, you will have to enable USB Debugging on your device.
  2. For that, head over to the Settings page and go to About phone.
  3. Then go to the Software information section and tap on Build Number 7 times.
  4. You will get a toast message that the Developer Options has been enabled.
  5. Now go back to the Settings page, scroll to the end you should see the Developer Options. [INTERESTING READ: How to Enable USB Debugging on a Broken Android Device’s Screen].

STEP 2: Enable OEM Unlocking on Samsung Galaxy A51


  1. Next up, you will have to enable OEM Unlock on your device. This option will allow you to carry out the unlocking process.
  2. So go to Developer Options, and enable the ‘OEM Unlocking’ toggle. [If you don’t see the OEM Unlock option or if it is greyed out, then refer to this guide: How to Fix Missing OEM Unlock in Samsung Devices].
  3. Then tap on Turn on in the confirmation dialog box that appears.

STEP 3: Boot Samsung Galaxy A51 to Download Mode

To boot your Samsung Galaxy A51 to Download Mode, follow the below steps. Or you may also refer to our detailed guide on this topic: How to Boot any Samsung Device to Download Mode.


  1. To begin with, power off your device.
  2. Then press and hold Vol Up + Vol Down together and connect your device to the PC via USB cable.
  3. As soon as you see the Warning message on your device, release the pressed keys.
  4. Finally, press the Volume Up key once and your device will be booted to Download Mode.

STEP 4: Unlock Bootloader on Samsung Galaxy A51 via Download Mode

  1. As of now, your device will be booted to Download Mode with the Warning Screen. So press and hold the Volume Up key for a few seconds.
  2. This will take you to the Device unlock mode (make sure you have taken a backup).
  3. You will now get a confirmation message whether you are sure to proceed ahead, use the Volume Up button to reply to the affirmation.
  4. It will now wipe off all the data on your device. Once that is done, your device should then automatically boot up to the OS.
  5. But wait, there’s more! Now the Vaultkeeper mechanism will come into the picture. Let’s deal with it and apply the finishing touch to unlock the bootloader on Samsung Galaxy A51.

STEP 5: Verify Galaxy A51 Bootloader Status with Vaultkeeper

  1. You will now have to notify the Vaultkeeper that you unlocked the device’s bootloader.
  2. To do so, head over to Settings and enable Developer Options as mentioned in STEP 1.
  3. Then go to Developer options and make sure that the OEM unlocking toggle is turned on and is greyed out as well.

That’s it. These were the detailed guide to unlock the bootloader on Samsung Galaxy A51. You may now go ahead and install TWRP and root your device as well. With that said, if you have any queries concerning the aforementioned steps, do let us know in the comments section below. We will get back to you with a solution at the earliest.