Smartphones > Oppo > Oppo F21s

Unlock your Oppo F21s

Specification Oppo F21s

Root Oppo F21s

Firmware Oppo F21s

Developer Mode Oppo F21s

Bypass Lock Screen Oppo F21s

Oppo F21s Factory Reset

Bypass FRP Oppo F21s

Secret codes Oppo F21s

Screenshot Oppo F21s

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.
• A menu will open on the PC screen, press Remove.
• The program will warn you about deleting all data from the smartphone, to continue working, click OK.
• Wait until the end of the operation, and put the phone into recovery mode.
• Click the Next button, then follow the steps recommended by the program to restore the device to factory settings and reboot it. 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.
  
  
• Select Recovery using volume buttons to navigate through the menu and confirm selection by pressing the power button.
• Select Wipe data/factory reset. using volume up/down buttons to navigate through the menu and confirm selection by pressing the power button.
• At the end, confirm the reset operation.

3. How to use a low battery to unlock a phone locked with a graphic key.

• You need to ensure that the phone battery is discharged. To speed up the process, make sure that the screen is constantly lit.
• When the battery has a few percent charge left, the phone will notify about this and open the menu with power settings, that is, it will unlock the phone.
• You need to open the menu with security settings and turn off the phone lock.

4. Delete 'gesture.key' and 'password.key' using Aroma File Manager.

• Turn off your phone and prepare a memory card.
• Copy the Aroma File Manager program to the phone's memory card. Insert a memory card into your smartphone.
• Using the combination of volume and power buttons, boot your smartphone into recovery mode.
• In recovery mode, select the Install zip option. Then select 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)
• Reboot your smartphone. The screen lock will be released.

5. Restore access to your smartphone using your Google Account.

• After several unsuccessful attempts to unlock the phone, the message Forgot password? will appear. Click on it.
• You will be asked to enter your Google Account username and password.
• Remove the screen lock from the settings.

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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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