How to Unlock the Bootloader on Your Android Phone?


Unlocking your bootloader is the first step towards rooting your phone and installing custom ROMs. It’s also the place where most people run into trouble—not because it's especially difficult, but because phone manufacturers and network carriers don’t want—or don't trust—you to unlock it. It's not unlike Android rooting, another superuser practice that manufacturers discourage.

How to Enable OEM unlocking
Before you can actually unlock your phone, you need to enable the OEM unlocking developer feature in Android.
  • Open the Settings app on your device.
  • Scroll down, and select System settings.
  • Under System settings, locate and select About phone.
  • Near the bottom of the screen, you’ll see the Build number. Tap it seven times to enable the developer options. When you reach the seventh time, you may be prompted for your password to confirm.

  • Return to the System settings.
  • Locate and select Developer options.
  • Find the OEM unlocking option, and toggle the switch on.
      
  • Scroll down and locate Android debugging. Toggle the switch on.

How to Install Android Tools
Enabling OEM unlocking only makes it possible to unlock the device. In order to actually unlock it, you’re going to need a couple of Android developer tools from Google. These are freely available, and they’re simple to use.

Windows

  1. Download Android Platform Tools zip 
  2. Unpack the ZIP file into a convenient folder. This is the folder you will run the tools out of, so it should be fairly easy to access.
  3. Right click in the folder window containing the extracted files. When the menu pops up, select Open command window here.

     UBUNTU/DEBIAN LINUX
      1. Open a terminal window.
      2. Use ‘sudo’ to get root privileges, and use the following command to install the Android tools.
      sudo apt install android-tools-adb android-tools-fastboot
      How to Unlock With Fastboot
      You’re ready to unlock your phone’s bootloader with the Fastboot tool that you just downloaded. Before you go any further, you should see if your phone requires a code from the manufacturer to unlock it. Here are the instructions for several major phone manufacturers:

      • LG
      • HTC
      • Motorola
      • Sony
      • Samsung – Only international Samsung phones with an Exynos processor can be unlocked.
      • Google phones can all be unlocked by default, unless you purchased them from a major carrier.

      1. Plug your phone into your computer with its USB cable.

      2. In the terminal (or Command Prompt), run the following command to connect your phone.
      adb devices 
      You’ll see a message requesting access on your phone. Check the box to always allow the connection, and confirm.


      3. Run the following command to reboot your phone into the bootloader.
        adb reboot bootloader
              
      4. Wait for your phone to reboot. You’re now ready to unlock with Fastboot. On newer devices and Google devices, run the following command:
      fastboot flashing unlocked

      5. On devices that require a code—or, possibly, some older devices—run this command:
      fastboot oem unlock <code> 
           
      6. After your see a confirmation message that your bootloader is unlocked, you can reboot it with Fastboot.
      fastboot reboot
          
      7.  As your phone reboots, you’ll probably see a warning that your bootloader is unlocked, and that it isn't secure. Continue booting. Your bootloader is unlocked, and you’re ready to continue on to flashing custom recovery and rooting your device. 

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