How to Unlock Bootloader of Samsung Galaxy S21 5G SM-G991B Easily [Simple Steps]

Today, will share a simple trick with Galaxy S21 SM-G991B (o1s) owners who are trying to unlock bootloader of their phone. It comes with 6.2 inches display, Mali-G78 MP14 graphics processing unit, 8GB RAM, 256GB internal storage space, 64MP rear camera, phase detection auto focus support, 4000mAh battery and Exynos 2100 processor. If you have recently bought Galaxy S21 5G SM-G991B, then you might be planning to unlock its bootloader. As we know, bootloader is a program that starts whenever phone is turned on. It activates the Android operating system on Galaxy S21 SM-G991B. Locked bootloader does not allow us to install custom ROM on our phone. It only loads the authorized Android OS with a digital signature. will help you in unlocking Galaxy S21 SM-G991B bootloader. You will be able to install custom ROM after unlocking bootloader. Previously, I have published the simple instructions for performing a hard reset of MetroPCS Samsung Galaxy J3 Prime SM-J327T1. Now, I will discuss about the step-by-step tutorial to unlock bootloader of Samsung Galaxy S21.

I am hoping that you will be able to unlock Galaxy S21 SM-G991B (o1s) bootloader without facing any problem after reading the tutorial written in Don’t forget to activate developer options. You must note that your Galaxy S21 SM-G991B will lose warranty after the bootloader unlock process. It will let you install Custom ROMs on your phone. You must activate OEM unlock option. Bootloader unlock process will also let you install Magisk on your phone, so you will be able to root your phone after unlocking its bootloader.

If you are planning to install official and unofficial LineageOS custom ROM on Galaxy S21 SM-G991B (o1s), then you must be eagerly waiting to unlock its bootloader. You must save your important documents securely including messages and contacts before unlocking bootloader of Galaxy S21 SM-G991B, because there is a possibility of losing all documents from your phone during bootloader unlock process.

Below are the steps using which you can unlock bootloader of Galaxy S21 SM-G991B. will not be responsible if your phone got broken during bootloader unlock process. Galaxy S21 battery must be above 86 percentage before bootloader unlock process. You have to activate developer options before unlocking it.

How to Unlock Bootloader of Samsung Galaxy S21 5G SM-G991B Easily [Simple Steps]

1. Tap “Settings” Menu on Galaxy S21, then you have to tap “About Phone” option.

2. Tap “Software Information” option.

3. Tap “Build number” option several times until you see “developer mode” message on your phone.

4. Tap “Settings” Menu again.

5. Tap “Developer options”, then activate “OEM unlocking” and “USB debugging” option.

6. Switch off your phone.

7. Install USB driver on desktop.

8. Connect your Galaxy S21 with computer via USB cable while pressing Volume down button and Volume up button simultaneously.

9. Long Press Volume up button for a few seconds to enter Device Unlock Mode.

10. Press Volume up button again to unlock bootloader.

You have successfully unlocked bootloader of Galaxy S21 SM-G991B (o1s). If you are experiencing any difficulty while unlocking Galaxy S21 bootloader, then don’t hesitate to share your issue with Please submit your email address and subscribe to get more information regarding Galaxy S21. You must check your email to activate subscription. I’ll help you in unlocking bootloader of your phone.

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