How to Unlock Bootloader on Any Android Smartphone

Android Smartphone

On this page, you will learn how to unlock the bootloader on your Android device. Here we will provide you a complete guide step by step on how to unlock your phone. But before starting the unlocking process, you must take a look at what is unlock bootloader is and what advantages and disadvantages are there if you unlock the bootloader?

What is Bootloader or Boot Manager?           

Bootloader or Boot manager is a small software programming code that is used to initiate your android smartphone, it is stored in the operating system of a device into memory. Bootloader guides your phone that which programs should be loaded in start-up and how to find the system kernel of your device. As we know every smartphone which is powered by OS (Operating System) must contain the Bootloading option. Android is a product of Google which is used in smartphones worldwide and Android making changes, developing operating systems from time to time with the latest upgraded features, android makes changes by the manufacturers according to their choice, and manufacturers also make changes in features and specifications in their phones to gain maximum local market interest. So every rooting procedure cannot be the same.

If you want to Root or upgrade your phone, mostly you need to unlock your bootloader, it means you need to have access as a superuser or administrator to your phone operating system, which runs your phone’s Rooting access and allow you to make changes to all settings and features.

Unlock Bootloader

Why do manufacturers lock bootloaders?

Nowadays in Smartphone manufacturing, every manufacturer handles boot loading differently from others. Most manufacturers locked bootloaders in their devices for security because they want only operating systems should be run in the device that is installed by the company, but some manufacturers launched their phones without bootload locking.

There are a few disadvantages or Risks of Bootloader Unlocking.

  • Due to unlocking, several changes can be made in system parts and functions which is very risky.
  • Security of value-added services, banking, and other confidential apps will no longer be available.
  • If the bootloader is unlocked, your device could be unsecure, and easily approachable by malware attacks and online thefts.
  • Anyone can easily flash your device.
  • Due to the Unlocking of the Bootloader, your smart Phone warranty can be void which is also risky.
  • By Bootloader unlocking, you may lose any system updates from the company in the future.

Where Bootloader is placed?

First of all, here we like to explain how ROM memory can be defined?

According to Glenn Brook shear. A small portion of a computer’s main memory where the CPU expects to find its initial program is constructed from special nonvolatile memory cells. Such memory is known as read-only memory (ROM),

ROM is the main storage hub in PC or smartphone for boot management. With the passage of time technology becoming more advance, mostly in the recent personal computers, Smartphone’s or upcoming devices have already dedicated storage partitions available on the motherboard to hold boot loading files,

If we talk about PC, so Bootloader is usually placed in the Master Boot Record called MBR in ROM (Read Only Memory), Which is a part of main memory located in BIOS (basic input/output system), but in an android smartphone, storage is like a hard drive which made of up several partitions, among those partitions one of them is located for android system files and rest of other partitions dedicated for applications and other data. The partition which has system files and built-in apps always remains secure either phone storage crash or reset.

Boat loading Types:

There are two different types of Boot loading, first is Cold booting, which means your phone or Tablet restart after have been already switched off, and second is Warm boating which your device OS alone restart without switched off because of a system crash, hang or freeze.


What is the Boot loading Process?

Bootloaders usually contain different ways to boot the OS kernel and also contain commands for debugging and modifying the kernel setup. The boot loading process varies by smartphones and their software versions, which are running in the devices. There are many tools and ways to let you unlock the bootloader, but often time companies update their software and block changes in bootloader setups, like; HTC, which lies among world-famous smartphone companies who use NAND LOCK which prevents rooting and other modifications.

Boot loading process initiates when you press your device power button, and the Boot ROM code starts executing from a pre-defined location that is hardwired in ROM. If you want to install any Custom ROM, first you need to Unlock Bootloader on your Phone.


The major advantage of boot loading is to Root any android phone. Rooting allows you to install custom ROM.

We always recommend you to use the factory setting because unlocking bootloader is an end-user choice.

We always guide you and of course, you may install all kinds of custom ROM, TWRP Recovery, such as Lineage OS, Resurrection Remix ROM, much more.
You can root your phone.
You can flash TWRP.

As you know that in this post we are publishing a full guide on unlocking the bootloader. We give you a lot of information to you, so that, you must be aware of the bootloader and what are the advantages or benefits you will get after unlocking it.
No doubt that a bootloader is a software piece. It is automatically running on your smartphone. The bootloader commands of the smartphone, it will indicate what programs to load to make your phone run. No doubt, it is most important to bootloader as that starts up your smartphone.
This is the reason that bootloaders are stored in a stable memory that away from your device reach. We are here to provide you with methods and solutions for every device that will help you to unlock the bootloader. Although, you must follow the steps very carefully to avoid any permanent damage caused to your device.

One thing to note is that unlocking your bootloader will void the warranty of your device. So, make sure that you are out of the warranty period or you are sure about what you are doing on your phone.

Disadvantages with unlocking the bootloader;

You can void your phone warranty.
There will be issues with official OTA updates.
Moreover, you can brick your device or stuck in a bootloop if you do not follow the steps to unlock the bootloader carefully.
But, there are certain advantages once, you have unlocked the bootloader of your device.

Pre-Requisites before Boot Loading or Rooting:

  1. For Unlocking Bootloader in your android smartphone needs Laptop/PC.
  2. Make sure that during Boot loading your android phone must be charged up to 70%, to avoid any sudden shutdowns during the process.
  3. Here we strongly recommend you to take a complete backup of your android smartphone before starting the flashing process.
  4. You need a USB Data cable to connect your phone to your Laptop/PC.

You need to download ADB and Fastboot Tools to Laptop or PC and extract it.

As we already mentioned above, about the bootloader, you need to have an unlocked bootloader to install custom ROMs, restricted apps, etc on your phone. Please follow the below steps to unlock the bootloader of the device;

Bootloader Unlocking Instructions:

  • Enable the developer option to activate OEM and USB debugging.
  • Go to your phone settings, then click on About Phone.
  • Now click 7 to 8 times on Build Number until you see a toast message “You are now a Developer’’.


  • Now enable OEM Unlock through Settings, then Developer Option and after that clicks on Enable OEM Unlock and USB Debugging.


  • Now Download ADB Fastboot zip and Extract its files in your Computer.
  • Connect your PC to Phone with data cable and wait for driver installations.
  • Open a Command Prompt Window by pressing Shift + Right-click on Mouse in ADB Fastboot Folder. Check the below image:


  • Now type the command in your command Window “ADB devices”.
  • Now allow USB Debugging. 


  • Now type “ADB reboot bootloader” in the command window to reboot your phone.
  • When your phone rebooted, it shows the phone’s bootloader is locked so now you need to type the command, “fastboot devices” to check fastboot drivers are correctly installed.


  • Now enter the command, “fastboot devices” to check proper device connectivity between PC and Phone.
  • Now in the list, if your device serial number shows up it means every step is successfully done, but if it is not showing, so it means drivers are not correctly installed in your device, you must fix your drivers to list your device under fastboot devices.
  • “fast boot OEM unlock” can also use instead of the above command, if it does not work.
  • After that, you will get confirmation as YES to unlock the bootloader, through navigation you need to click yes.


  • After this, your phone reboots into bootloader mode.
  • Now you can again enter the command, “fastest reboot” to reboot your device.
  • Now, the device will reboot and all data will be erased.

Note: The above info is only for journal public interest, or the author is not responsible for any hardware and software loss damage or illegal misusage of the above material.


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