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This is a generic method and isn't guaranteed to work on every device.

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Credits
Spanish & Portuguese translation by Juan Rios

Video Transcript

00:10
In this video tutorial, I'm going to explain how to unlock the bootloader for an Android device

00:16
using your ADB and fastboot

00:18
You need to unlock the bootloader in order to be able to write images via Fastboot or via the bootloader

00:25
Before you can unlock the bootloader, you need to have enabled

00:30
USB debugging and OEM unlocking so you go under Settings

00:35
And you scroll down to About and

00:39
Then scroll down to Build Number. Keep tapping till you see You are now a developer, just keep tapping build number

00:46
All right. I already did that?

00:50
Once you've done that, you go back and should have developer options enabled here

00:55
You should see that here. So you select developer options.

00:59
Now you scroll down here and you enable USB debugging. I already have that enabled.

01:05
You might get a prompt asking you to always allow. Just tick and allow.

01:11
Then you also enable OEM Unlocking.

01:15
Its very important you enable this in order to unlock the bootloader?

01:19
Now, once you have USB Debugging and OEM Unlocking enabled

01:23
make sure you've setup ADB on your PC and then we can return to unlocking the bootloader

01:32
Now, in ADB, you need to test ADB connection by typing adb devices

01:44
and you have a detection. You are going to boot the device into bootloader or fastboot by typing adb reboot-bootloader

01:53
and you tap enter so that's going to boot the device into

02:02
Fastboot and you should see

02:05
a black screen with fastboot written somewhere on the screen. In fastboot, test connection by typing

02:13
fastboot devices

02:16
Now, you want to unlock by typing fastboot. (don't forget that the command might vary)

02:23
fastboot oem unlock

02:25
For some devices, its fastboot flashing unlock , fastboot oem unlock-go or something like that

02:32
but just try this command first and research other commands if this one fails fastboot oem unlock.

02:38
Tap Enter. Now in the screen, you're going to get a prompt asking you to press the volume up

02:43
if you want to unlock or volume down if you want to cancel so I'm going to tap the

02:49
volume

02:51
increase

02:52
button, and then

02:54
wait while the

02:56
bootloader gets unlocked

03:07
So I see unlock pass returning to fastboot . For me to confirm that my bootloader has been unlocked, I type

03:17
fastboot gervar unlocked

03:23
And I see unlocked: Yes, so my bootloader has been unlocked. That's how to unlock the bootloader of an Android device

03:30
using your ADB and fastboot