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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 --------------------------
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