How to Unlock Bootloader on Android

Unlocking the Bootloader is the first step towards fully customizing your Android device. It allows you to install custom ROMs, gain root access, and apply various modifications. However, unlocking the Bootloader comes with certain risks, such as voiding your warranty and potential data loss. In this guide, we'll walk you through the process of unlocking the Bootloader on your Android device.

What is a Bootloader?

A Bootloader is a program that initializes the operating system when your device starts up. By default, the Bootloader is locked by the manufacturer to prevent changes to the system. Unlocking the Bootloader gives you access to system files but also removes the device’s security protections, so proceed at your own risk.

Requirements Before You Start

  • Backup Your Data: Unlocking the Bootloader will erase all data on your device, so make sure to back up important files beforehand.
  • Install ADB and Fastboot Drivers: You'll need to install Android Platform Tools on your computer.
  • Charge Your Device: Ensure your phone has at least 70% battery to avoid shutdowns during the process.

Step 1: Enable Developer Options and USB Debugging

  1. Go to your device's settings and open About Phone.
  2. Find the Build Number and tap it 7 times until you see a message saying "You are now a developer!"
  3. Go back to the main settings and open the Developer Options menu.
  4. Enable USB Debugging and OEM Unlocking.

Step 2: Connect Your Device to the Computer

Connect your Android device to your PC using a USB cable. Make sure USB Debugging is enabled and your device is recognized by the computer.

Step 3: Boot Your Device into Fastboot Mode

  1. Open the Command Prompt (Windows) or Terminal (Mac/Linux) on your computer.
  2. Enter the following command: 
    adb reboot bootloader
  3. Your device will restart in Fastboot mode.

Step 4: Unlock the Bootloader

To unlock the Bootloader, type the following command:

fastboot oem unlock

For some devices (e.g., Xiaomi), use:

fastboot flashing unlock

A confirmation screen will appear on your device. Use the volume buttons to select Yes and confirm with the power button.

Step 5: Reboot Your Device

After successfully unlocking the Bootloader, enter the following command:

fastboot reboot

Your device will reboot, and the Bootloader will now be unlocked.

What to Do After Unlocking the Bootloader?

Once the Bootloader is unlocked, you can explore the following options:

  • Install custom ROMs (e.g., LineageOS or Pixel Experience).
  • Gain root access using Magisk.
  • Install a custom recovery (e.g., TWRP).

Potential Risks and Precautions

  • Unlocking the Bootloader may void your device’s warranty.
  • All data will be wiped, so ensure you have a backup.
  • There's a risk of bricking your device if the process is done incorrectly.