How to Unlock Bootloader in Samsung Galaxy M21

Samsung Galaxy M21 Bootloader Unlock

People of all shapes, sizes, ages, and backgrounds spend a significant amount of time on their smartphones these days. They have evolved into an important aspect of modern life and may be beneficial to everybody. Smartphones are used in a variety of ways, and one person’s usage of one device may be extremely different from another’s, but there is a handful that is more prevalent and fascinating. Nowadays Android device owners can’t stop themselves from tinkering, altering, modifying, and optimizing the internal system and OS, such as installing a new custom ROM, backing up system data, personalizing the Android device, rooting the device, and so on. However, before customizing the entire system, the user needs to understand the bootloader and how to unlock the bootloader of an Android smartphone.

Samsung Bootloader Unlock How to Unlock Bootloader in Samsung Galaxy M21

Also Read: Samsung Galaxy M21 USB Driver Download

Samsung Galaxy M21

Samsung’s Galaxy series of smartphones is the most well-known, with the Galaxy S and M being the most popular. The Galaxy S and M series are Samsung’s high-end and mid-range smartphone lines, respectively, and compete directly with the Apple iPhone. Over the years, it has become a popular favourite, with exports in the millions and millions.

To compete with Chinese manufacturers such as Xiaomi and Realme, Samsung launched the Galaxy M series as an online-only line. Due to their competitive cost when compared to Samsung’s other products, the gadgets released as part of this series have earned a lot of popularity. To keep prices down, Samsung has begun producing phones in the Galaxy M series out of plastic. The Galaxy M21 12,499 appears to have been created with a limited budget in mind. The Galaxy M21 is the successor of the Galaxy M20 , however it appears to be more similar to the Galaxy M30s , which was released in mid-2019.

The Samsung Galaxy M21 boasts a large 6.4-inch display with small bezels on the top and sides. The chin is noticeably larger. It sports a water drop notch at the top that houses the selfie camera and a little earpiece above it. Plastic is used for the rear panel, which has a glossy surface. It is quite good at picking up fingerprints.


The newer Galaxy M21 has a 20-megapixel selfie camera, which is greater resolution than the Galaxy M30s’ 16-megapixel sensor. The Galaxy M21 includes a triple camera arrangement, with the main camera having a 48-megapixel sensor with an f/2.0 aperture. There’s also a 5-megapixel depth sensor and an 8-megapixel ultra-wide-angle camera with an f/2.2 aperture. A 6.4-inch AMOLED display with full-HD+ resolution graces the Galaxy M21. Samsung has once again picked the Exynos 9611 SoC. The Galaxy M21, as well as the Galaxy M31 14,999 and Galaxy M30s, is now powered by it. This is an octa-core processor with four high-performance ARM Cortex-A73 cores clocked at 2.3GHz and four high-efficiency ARM Cortex-A53 cores clocked at 1.8GHz.

The Galaxy M21 features two Nano-SIM slots and is a dual-SIM handset. It also features a microSD card slot for additional storage. Dual 4G VoLTE, Bluetooth 5, dual-band Wi-Fi, and four satellite navigation systems are all supported. A 6,000mAh battery is included. On top of Android 10 (the most recent version of Android), the Galaxy M21 runs One UI 2.0. The user interface is comparable to the Galaxy M31’s. The Galaxy M21 comes in two flavours: 4GB of RAM and 64GB of storage, and 6GB of RAM and 128GB of storage.

What is Bootloader ?

A bootloader is a piece of software that allows a system to start up. The software on a system, including operating systems, application programs, and data, is saved in non-volatile memory after it is switched off. When a system is first turned on, it usually lacks an operating system and a loader in random-access memory (RAM). Before accessing the nonvolatile device or devices from which the operating system programs and data may be loaded into RAM, the system first executes a very tiny program stored in read-only memory along with the essential data to initialize RAM. A bootstrap loader, often known as a bootstrap or boot loader, is a short software that initiates this procedure.

A bootloader is a vendor-specific image that is responsible for booting up a device’s kernel. It is responsible for initializing the Trusted Execution Environment and binding its root of trust, as well as guarding the device state. Before shifting execution to the kernel, the bootloader examines the integrity of the boot and recovery partitions and displays boot state warnings.

When the phone won’t start properly or need to access particular system tools to assist the address problems, one can utilise the Bootloader. It might need to utilise it in the following situations:

  • Factory resetting a phone that can’t be reset any other way
  • Restarting a phone that can’t be restarted otherwise
  • Cache partition erasure
  • Viewing important details about the phone

Requirements for Unlocking the Bootloader 

  • Charge Your Phone To 100% Or At Least 75% With The Bootloader
  • Only the Samsung Galaxy M21 is covered in this guide. Please don’t use this method on any other devices.

Benefits of Bootloader Unlocking

  • Once you’ve unlocked the bootloader, you may install custom ROMs.
  • One Can Root Samsung Galaxy M21 After Unlocking Bootloader
  • TWRP Recovery For Samsung Galaxy M21 Is Simple To Install
  • Boost the Performance of the Phone

Demerits of Bootloader Unlocking

  • The phone’s warranty will be void if you unlock it.
  • Could have Issues With OTA Updates
  • Might Get Stuck In A Boot Loop While Rooting Or Installing A Custom ROM.

How to Unlock Bootloader in Samsung Galaxy M21 Step by Step: 

The Samsung Galaxy M21 is an entry-level phone in the budget sector. Even though it has a lot of great features, some users may wish to play with the internal system and OS, such as installing a new custom ROM, backing up system data, customising the Android device, rooting the device, and so on. The bootloader is essential for this method, and we will describe how to unlock the bootloader in the Samsung Galaxy m21.

Steps to Unlock Bootloader :

  • Use the power button to turn on the SAMSUNG Galaxy M21.
  • Turn on Wi-Fi and connect to the internet using your favourite router.
  • Check to see whether your SAMSUNG Galaxy M21 has received a firmware update in the settings menu.
  • On the Galaxy M21, enable Developer Mode.
  • Start the Settings programme.
  • Scroll down and select Developer Options from the drop-down menu
  • Turn the OEM Unlock switch on.
  • Tap the enable option to confirm.
  • Use the power button to turn off the SAMSUNG Galaxy M21. To enter download mode, press Volume Up + Volume Down and connect your device to a PC.
  • Then keep the volume up button down until the bootloader unlock menu appears.
  • To finalise the bootloader unlock procedure, press the volume up button one more.
  • If you receive a notice from SAMSUNG Galaxy M21 stating that all data will be wiped, simply confirm that you understand and the procedure will commence.
  • SAMSUNG Galaxy M21 will reboot when the procedure is completed, and the device will have an unlocked bootloader, which SAMSUNG Galaxy M21 will display on the screen.
  • That’s all, everything went well, and you may now write to the phone’s ROOT, Custom Recovery, or Custom Firmware.


Before using Bootloader, it’s important to think about the system requirements as well as the benefits and drawbacks. The procedure described above will root the Samsung M21, allowing you to enjoy all of the phone’s root features. However, there are a few things one should know before resetting the phone. Because Samsung uses dual-layer security, one must follow the instructions while rebooting the system.