How to Unlock the Bootloader on OPPO F21s Pro 4G

OPPO F21s Pro 4G

The vast majority of OPPO F21s Pro 4G owners are not aware of the feature called the "bootloader". Some people may confuse it with the standard Downloads application, through which files can be downloaded from the Internet. But advanced users know about this term and understand that they need to unlock the bootloader on OPPO F21s Pro 4G.

What is a Bootloader and What is It Used For

For a start, it's worth discussing the bootloader itself. Bootloader is the engineering menu of OPPO F21s Pro 4G, which functionally resembles the BIOS on a computer. It allows for deep-level manipulation of the smartphone, not just a factory reset.

By default, the bootloader is locked. This is done so that novice users do not make a fatal mistake when editing the device kernel or brick their OPPO F21s Pro 4G. Still, unlocking the bootloader gives the smartphone owner the following benefits:

  • the ability to install custom firmware;
  • root rights for extended access to the device;
  • installation of mods and patches for the current version of the OS.

Generally, unlocking the bootloader provides the user with a lot of features, but only experienced users can fully appreciate them. If you are one of such users, then it is recommended that you read the detailed instructions for unlocking the bootloader.

Precautions

Before reading the guide to unlocking the bootloader, you need to take into account a number of dangers inherent to the operation. First, after its completion, OPPO F21s Pro 4G will be automatically void of its warranty, as in the case of obtaining root rights.

Second, after the bootloader is unlocked, system components will become more susceptible to all kinds of threats. Finally, an unlocked phone can be easily recovered by an intruder who has stolen or found the device on the street.

Unlocking the Bootloader on OPPO F21s Pro 4G

After reviewing the aforementioned info, you can proceed to the procedure itself. It consists of three stages, each of which needs to be carried out by the user.

1. Status Validation

First you need to understand if bootloader is actually locked on your OPPO F21s Pro 4G. After all, it is possible that you purchased the device second hand, and the previous owner has already performed the appropriate steps.

The check is carried out by direct interaction of the phone with the computer. The steps are as follows:

  1. Download and unzip the ADB and Fastboot debug bridge package to your PC.
  2. Download and install the driver to interact with the smartphone using the official Android website.

  3. After installation, the ADB interface should be displayed in the Device Manager.
  4. Put your smartphone into fastboot mode by first turning it off and holding down the volume down key along with the power button.
  5. Connect your mobile device to your computer.
  6. Launch Command Prompt on your PC.
  7. Enter the following: "cd [path to the adb and fastboot folder]" and press Enter.
  8. Use the "fastboot devices" command to detect the phone connected to the PC.
  9. Enter the prompt “fastboot oem device-info” to determine the bootloader status.

In the information displayed by the command line we will be looking for the line "Device unlocked". If the value opposite it is "false", it means that the bootloader is locked. If “true”, bootloader was unlocked earlier.

2. Sending a Request

To remove the bootloader lock on OPPO F21s Pro 4G, you need to send the corresponding application to the manufacturer:

  1. Open the official website of the firmware developer.
  2. On the unlock page, click the "Unlock Now" button.
  3. Authorize your account (it was created when the phone was first set up), and indicate the reason for unlocking (for example, for flashing).
  4. Confirm ownership of the device using the code from the reply SMS.

Then you will have to wait for the manufacturer to approve the request, and you will be able to use all the functionality of the bootloader.

3. Approval of the Application and Unlocking

To see if you managed to convince the manufacturer to unlock the bootloader on the OPPO F21s Pro 4G, open the request page. If approved, a confirmation will be displayed on that page.

Now the user will be invited to download the software for unlocking the bootloader. It is installed via PC.

Next, you need to open the phone settings, then go to the Developers section and select the "Factory Unlock" item.

In the "Status" you need to go through authorization to the account, which was indicated on the manufacturer's website.

Now put your phone into fastboot mode and run the downloaded software on your computer.

After authorization, you need to connect your smartphone to the PC and confirm the unlocking.

After a couple of minutes, the operation will be completed and the bootloader on the OPPO F21s Pro 4G will be fully unlocked.

Share this page with your friends:

See also:



How to flash OPPO F21s Pro 4G

How to root OPPO F21s Pro 4G

Hard reset for OPPO F21s Pro 4G

How to reboot OPPO F21s Pro 4G

How to unlock OPPO F21s Pro 4G

What to do if OPPO F21s Pro 4G won't turn on

What to do if OPPO F21s Pro 4G doesn't charge

What to do if OPPO F21s Pro 4G doesn't connect to PC via USB

How to take a screenshot on OPPO F21s Pro 4G

How to reset FRP on OPPO F21s Pro 4G

How to call recording on OPPO F21s Pro 4G

How to update OPPO F21s Pro 4G

How to connect OPPO F21s Pro 4G to TV

How to clear the cache on OPPO F21s Pro 4G

How to backup OPPO F21s Pro 4G

How to disable ads on OPPO F21s Pro 4G

How to clear storage on OPPO F21s Pro 4G

How to increase font on OPPO F21s Pro 4G

How to share internet on OPPO F21s Pro 4G

How to transfer data to OPPO F21s Pro 4G

How to recover photos on OPPO F21s Pro 4G

How to record the screen on OPPO F21s Pro 4G

How to find blacklist in OPPO F21s Pro 4G

How to set up fingerprint on OPPO F21s Pro 4G

How to block number on OPPO F21s Pro 4G

How to enable auto-rotate on OPPO F21s Pro 4G

How to set up or turn off an alarm on OPPO F21s Pro 4G

How to change ringtone on OPPO F21s Pro 4G

How to enable battery percentage on OPPO F21s Pro 4G

How to turn off notifications on OPPO F21s Pro 4G

How to turn off Google assistant on OPPO F21s Pro 4G

How to turn off the lock screen on OPPO F21s Pro 4G

How to delete app on OPPO F21s Pro 4G

How to recover contacts on OPPO F21s Pro 4G

Where is the recycle bin on OPPO F21s Pro 4G

How to install WhatsApp on OPPO F21s Pro 4G

How to set contact photo in OPPO F21s Pro 4G

How to scan QR code on OPPO F21s Pro 4G

How to connect OPPO F21s Pro 4G to computer

How to install SD card in OPPO F21s Pro 4G

How to update Play Store in OPPO F21s Pro 4G

How to install Google Camera in OPPO F21s Pro 4G

How to enable USB debugging on OPPO F21s Pro 4G

How to turn off OPPO F21s Pro 4G

How to charge OPPO F21s Pro 4G

How to use the camera on OPPO F21s Pro 4G

How to find lost OPPO F21s Pro 4G

How to set password on OPPO F21s Pro 4G

How to turn on 5g on OPPO F21s Pro 4G

How to turn on VPN on OPPO F21s Pro 4G

How to install apps on OPPO F21s Pro 4G

How to insert a SIM card in OPPO F21s Pro 4G

How to enable and configure NFC on OPPO F21s Pro 4G

How to set time on OPPO F21s Pro 4G

How to connect headphones to OPPO F21s Pro 4G

How to clear browser history on OPPO F21s Pro 4G

How to disassemble OPPO F21s Pro 4G

How to hide an app on OPPO F21s Pro 4G

How to download YouTube videos on OPPO F21s Pro 4G

How to unblock a contact on OPPO F21s Pro 4G

How to turn on the flashlight on OPPO F21s Pro 4G

How to split the screen on OPPO F21s Pro 4G

How to turn off the camera sound on OPPO F21s Pro 4G

How to trim video on OPPO F21s Pro 4G

How to check RAM in OPPO F21s Pro 4G

How to bypass the Google account on OPPO F21s Pro 4G

How to fix black screen on OPPO F21s Pro 4G

How to change the language on OPPO F21s Pro 4G

How to open engineering mode in OPPO F21s Pro 4G

How to open recovery mode in OPPO F21s Pro 4G

How to find and turn on a voice recorder on OPPO F21s Pro 4G

How to make video calls on OPPO F21s Pro 4G

OPPO F21s Pro 4G sim card not detected

How to transfer contacts to OPPO F21s Pro 4G

How to enable/disable «Do not disturb» mode on OPPO F21s Pro 4G

How to enable/disable answerphone on OPPO F21s Pro 4G

How to set up face recognition on OPPO F21s Pro 4G

How to set up voicemail on OPPO F21s Pro 4G

How to listen to voicemail on OPPO F21s Pro 4G

How to check the IMEI number in OPPO F21s Pro 4G

How to turn on fast charging on OPPO F21s Pro 4G

How to replace the battery on OPPO F21s Pro 4G

How to update the application on OPPO F21s Pro 4G

Why the OPPO F21s Pro 4G discharges quickly

How to set a password for apps in the OPPO F21s Pro 4G

How to format OPPO F21s Pro 4G

How to install TWRP on OPPO F21s Pro 4G

How to set up call forwarding on OPPO F21s Pro 4G

How to empty the recycle bin on OPPO F21s Pro 4G

Where to find the clipboard on OPPO F21s Pro 4G

How to Unlock the Bootloader on Another Phones