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Unlock your OPPO F21


 Specification OPPO F21 
 Root OPPO F21 
 Firmware OPPO F21 
 Developer Mode OPPO F21 
 Bypass Lock Screen OPPO F21 
 OPPO F21 Factory Reset 
 Bypass FRP OPPO F21 
 Secret codes OPPO F21 
 Screenshot OPPO F21 

OPPO F21


OS: Android 10, ColorOS 7.2

CPU: Octa-core (2x2.0 GHz Cortex-A76, 6x2.0 GHz Cortex-A55)
RAM: 8 GB
Display: 6.5 inches
Camera: 16 MP (wide), 8 MP (ultrawide), 2 MP (depth)
Battery: Li-Po 4,500 mAh, Fast charging 64W


1. Use the Tenorshare 4uKey for Android app.
2. Make a hard reset (factory reset).
3. How to use a low battery to unlock a phone locked with a graphic key.
4. Delete 'gesture.key' and 'password.key' using Aroma File Manager.
5. Restore access to your smartphone using your Google Account.

1. Use the Tenorshare 4uKey for Android app.
  • Connect your phone to PC and launch Tenorshare 4uKey for Android.
  • Press the Remove button on the PC screen
  • After verifying the data, the removal of the smartphone screen lock will begin. Confirm the deletion, click OK.
  • Wait until the end of the operation, and put your smartphone into recovery mode according to the prompts on the computer screen.
  • Click the Next button and follow the instructions on the screen. After rebooting the smartphone, the screen lock will be disabled.


2. Make a hard reset (factory reset)
  • To get started, turn off your smartphone.Simultaneously press and hold for about 10-15 seconds one of the button combinations:
    Volume down button + Power button;
    Volume up button + Power button;
    Volume down button + Power button + Home button;
    Volume down button + Volume up button + Power button.

  • Using the volume buttons to navigate through the menu, select Recovery and press the power button
  • Using the volume up / down buttons, select Wipe data/factory reset. and press the power button.
  • Confirm the reset and restart your smartphone


3. How to use a low battery to unlock a phone locked with a graphic key.
  • You need to wait until the battery of the smartphone is discharged.
  • When a few percent of the charge remains, the phone will report this and open a menu with power settings, that is, the lock will be removed.
  • You need to quickly open the menu item with security settings and disable the lock.


4. Delete 'gesture.key' and 'password.key' using Aroma File Manager.
  • Turn off your phone and prepare a memory card.
  • Download Aroma File Manager via computer to your phone's memory card. Insert a memory card into your smartphone.
  • Using a combination of buttons, put your smartphone into recovery mode.
  • In recovery mode, select Install zip -> Install zip from sdcard -> Choose zip from sdcard, go to the archive folder with this program and select it.
  • You need to go to the /data/system folder and delete the files 'gesture.key' and 'password.key' (for the Android 4.4 or lower operating system) or 'getekeeper.password.key' and 'getekeeper.pattern. key' (for Android 5 operating system or higher)
  • Restart your smartphone. The screen lock will be released.


5. Restore access to your smartphone using your Google Account.
  • After several unsuccessful ways to unlock the phone, Forgot password? will appear on the screen. Click on it.
  • Choose to restore access with your Google Account. You will need to enter your Google Account username and password.
  • Remove the screen lock in the settings.

Thomas Nilan
Smartphone Expert
Thomas Nilan is a mobile phone expert with in-depth knowledge of the Android and iOS operating systems, who understands the settings of various hidden features that allow you to expand the capabilities of your smartphone, as well as get information about what is going on inside the phone for future repairs. He is an authority in his field, which has allowed him to become a ghostwriter for several technology publications, and he enjoys writing small mobile applications for testing smartphones.


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