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Unlock your Sansui U42


 Specification Sansui U42 
 Root Sansui U42 
 Firmware Sansui U42 
 Developer Mode Sansui U42 
 Bypass Lock Screen Sansui U42 
 Sansui U42 Factory Reset 
 Secret codes Sansui U42 
 Screenshot Sansui U42 

Sansui U42


OS: Android v4.4.2 (KitKat)

CPU: 1.2 GHz, Single Core Processor
RAM: 512 MB
Display: 4 inches, 480 x 800 pixels
Camera: 3.2 MP
Battery: 1450 mAh, Li-ion Battery


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.
  • In the menu that appears on the PC screen, click Remove.
  • After verifying the data, the removal of the smartphone screen lock will begin. The program will warn you about deleting all data on the phone, to continue working, click OK.
  • After the process of removing the lock is completed, put the phone 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.

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


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 phone is discharged.
  • When the battery has a few percent left, the phone will report this and open a menu with power settings, that is, it will unlock the phone.
  • You need to open the 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.
  • Copy the Aroma File Manager program to the phone's memory card. Insert the memory card back into the phone.
  • Put your smartphone into recovery mode using the button combinations that are suitable for your particular model.
  • In recovery mode, follow the path 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)
  • Reboot your smartphone.


5. Restore access to your smartphone using your Google Account.
  • When you try to unlock the phone several times, Forgot password? will appear on the screen. Click on it.
  • Choose the option - recovery with a 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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