Unlocking the bootloader of your Android device gives you full control over its firmware. Whether you want to install a custom ROM, root your device, or flash a custom recovery like TWRP, unlocking the bootloader is the first step. This guide will walk you through the process using Fastboot.

The instructions are suitable for Windows and Linux servers. You can perform the procedure on any standard PC or VPS that supports ADB and Fastboot tools via command-line interface.

⚠️ Disclaimer: Unlocking the bootloader will erase all data on your device and may void your warranty. Proceed at your own risk.

What You Need Before You Begin

  1. A Windows, macOS, or Linux computer

  2. USB cable

  3. ADB and Fastboot tools installed

    • Download from the official Android developer site or use SDK Platform Tools

  4. Device-specific unlock permission

    • Some manufacturers (like Xiaomi, Motorola, or Huawei) require you to request unlock authorization

Step-by-Step Instructions

1. Enable Developer Options

  • Go to Settings > About phone

  • Tap Build number 7 times until you see “You are now a developer!”

2. Enable OEM Unlocking and USB Debugging

  • Go to Settings > System > Developer Options

  • Toggle on:

    • OEM Unlocking

    • USB Debugging

3. Boot into Fastboot Mode

  • Power off the device

  • Hold Volume Down + Power until you see the Fastboot screen

  • Connect the device to your PC via USB

4. Open Terminal or Command Prompt

  • Navigate to the folder with Fastboot tools

  • Run the following command to check connection:

    fastboot devices

5. Unlock the Bootloader

Run the following command:

fastboot oem unlock

Or, on newer devices:

fastboot flashing unlock

  • Follow on-screen instructions on your device to confirm

  • Device will reboot and factory reset itself

Re-locking the Bootloader (Optional)

If you want to re-lock the bootloader:

fastboot oem lock

Or:

fastboot flashing lock

Conclusion

Unlocking the bootloader opens up new possibilities for your Android device—but also increases risks if done improperly. Always back up your data, follow manufacturer-specific instructions, and be cautious when flashing unknown firmware.