How to Unlock Bootloader on Android

Edited 2 weeks ago by ExtremeHow Editorial Team

AndroidBootloaderFirmwareSmartphonesRootingCustom ROMsMobile DevicesSettingsDevelopmentModding

In this detailed guide, we will explore the entire process of unlocking the bootloader on an Android device. Unlocking the bootloader is often the first step to rooting your Android phone or installing a custom ROM. This process is a must for those who want to gain full control over their device. Although the terminology may seem complicated at first, you will find that these steps are quite simple to follow. We will walk you through every detail, provide examples, and cover common problems you may encounter.

Understanding the bootloader and its functions

Before diving into the steps, it's important to understand what a bootloader is. The bootloader is a program that loads the operating system onto your device. It's the first thing that runs when you turn on your phone. The bootloader is responsible for booting the phone and making sure the operating system is working correctly.

Manufacturers lock the bootloader in smartphones to ensure that users are running a certified version of the operating system. This means that by default, users cannot make changes to the system software. However, unlocking the bootloader allows you to install custom firmware, giving you more control and customization over your Android device.

Step-by-step guide to unlocking bootloader

Step 1: Back up your data

Before you begin the bootloader unlocking process, it is important to backup your Android device. Unlocking the bootloader will erase all your data, including contacts, photos, apps, and settings. Use a cloud service or connect your device to a computer to save a copy of your important data.

Step 2: Enable Developer Options

To unlock the bootloader, you need to enable developer options on your Android device. You can do it as follows:

• Go to the Settings app on your device.
• Scroll down and tap About Phone or About Device.
• Find Build number and tap on it seven times. You will see a message saying, "You are now a developer!"

Step 3: Enable OEM unlocking

Once you have enabled Developer Options, the next step is to enable OEM unlocking. Follow these steps:

• Go back to Settings.
• Tap Developer options.
• Look for OEM Unlocking and turn it on. Confirm your choice if prompted.

Step 4: Install ADB and Fastboot

To unlock the bootloader, you need to install the Android Debug Bridge (ADB) and Fastboot tools on your computer. These are command-line tools that let you interact with your device. Follow these steps:

• Download the ADB and Fastboot tools from the Android Developer website or any trusted source.
• Extract the downloaded files to a location on your PC, such as C:\adb.
• Open a command prompt or terminal window and navigate to this folder. You can do this by typing cd C:\adb in the command prompt.

Step 5: Boot your device into fastboot mode

To unlock the bootloader, your phone needs to be in fastboot mode. Here's how to do it:

• Turn off your device.
• Press and hold the Power and Volume Down buttons simultaneously until the Fastboot screen appears.
• Connect your Android device to your computer using a USB cable.

Step 6: Verify Fastboot connection

Once your device is in fastboot mode, verify the connection with your computer by entering the following command into Command Prompt or Terminal:

fastboot devices

If your device is connected correctly, you will see a serial number in the terminal, indicating that fastboot recognizes the connection.

Step 7: Unlock the bootloader

To unlock the bootloader use the following command:

fastboot oem unlock

Alternatively, you may have to use another command depending on your device manufacturer:

fastboot flashing unlock

A confirmation message will appear on your device's screen. Follow the on-screen prompts to confirm the unlocking process, usually by navigating with the volume buttons and confirming with the power button.

Step 8: Reboot your device

Once the bootloader is unlocked, reboot your device using the following command:

fastboot reboot

Your device will restart with the bootloader unlocked. Keep in mind that the device will perform a factory reset, erasing all data.

Considerations and risks

There are many benefits to unlocking the bootloader, such as allowing you to customize and root your device, but there are some risks associated with it too:

• Warranty Void: Most manufacturers will void the warranty if the bootloader is unlocked.
• Security risks: An unlocked bootloader can make your device vulnerable to malware and unauthorized access.
• Data loss: As mentioned earlier, unlocking the bootloader will erase all the data on your device.

Troubleshooting common problems

Although the process mentioned is simple, you may still face some issues. Let's discuss the common problems:

Device not recognized

If your device is not recognized in Fastboot Mode, make sure of the following:

• Proper Drivers: Make sure that the ADB and Fastboot drivers are correctly installed on your computer.
• USB Cable: Use a good quality USB cable and use a different USB port on your computer.

Fastboot command not working

If fastboot commands are not executing, confirm these:

• Correct directory: Make sure your command prompt/terminal is in the directory with the fastboot tools.
• The device is in the correct mode: Verify that your device is correctly in fastboot mode.

Relocking the bootloader

If you decide to go back, you can re-lock the bootloader. Note that doing this usually requires re-flashing the stock firmware, and your data will be wiped again. Use the following command while in fastboot mode:

fastboot oem lock

Or:

fastboot flashing lock

It is important that you have the official firmware downloaded and ready, as you may need it.

Conclusion

Unlocking the bootloader of an Android device can be an exciting and rewarding experience for those who want to gain the highest level of control over their device. This guide provides the necessary procedure that, when followed carefully, allows for customization beyond the standard manufacturer's restrictions. However, with power comes responsibility, and it is imperative to understand the risks involved and take the necessary precautions. Approach the unlocking process with patience and caution, and make sure you have a full backup and understanding of each step.

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