Unlock your Blackview BV4900

OS: Android 10

CPU: Quad-core 2.0 GHz Cortex-A53

RAM: 32GB 3GB RAM

Display: 5.7" inc

Camera: 8 MP, f/2.4, (wide), AF

Battery: 5580 mAh, Li-Po, non-removable

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 smartphone to your PC and launch the 4uKey for Android program.
In the menu that opens, click Remove.
The program will warn you about deleting all data on the phone, to continue working, click OK.
Wait until the lock is removed, and then put your smartphone into recovery mode according to the prompts on the computer screen.
Click the Next button, then follow the steps recommended by the program to restore the device to factory settings and reboot it. After starting the smartphone, the screen lock will be disabled.

2. Make a hard reset (factory reset)

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, select Recovery and press the power button.
Select Wipe data/factory reset. by using the volume buttons to move through the menu and confirm the selection by pressing the power button.
Confirm the reset.

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

You need to wait for the battery to drain.
When the battery has a few percent charge left, the phone will notify you 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 smartphone and remove the memory card from it.
Copy Aroma File Manager to your phone's memory card. Insert a memory card into your smartphone.
Using the combination of volume and power buttons, put the smartphone into recovery mode.
In recovery mode, select the option Install zip -> Install zip from sdcard -> Choose zip from sdcard, go to the archive folder with this program and select it.
After running the program, you will need to select the folder /data/system and delete the files 'gesture.key' and 'password.key' (for Android 4.4 or lower) or 'getekeeper.password.key' and 'getekeeper.pattern.key' (for Android 5 or higher)
Restart your smartphone. The block will be removed.

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

After unsuccessful attempts to unlock the phone, Forgot password? will appear on the phone screen. Click on it.
You will need to enter your Google Account username and password.
Remove the screen lock.

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.