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Unlock your Samsung Galaxy Grand Quattro (Win Duos) I8552


 Specification Samsung Galaxy Grand Quattro (Win Duos) I8552 
 Bypass FRP Samsung Galaxy Grand Quattro (Win Duos) I8552 
 Root Samsung Galaxy Grand Quattro (Win Duos) I8552 
 Firmware Samsung Galaxy Grand Quattro (Win Duos) I8552 
 Developer Mode Samsung Galaxy Grand Quattro (Win Duos) I8552 
 Bypass Lock Screen Samsung Galaxy Grand Quattro (Win Duos) I8552 
 Samsung Galaxy Grand Quattro (Win Duos) I8552 Factory Reset 
 Secret codes Samsung Galaxy Grand Quattro (Win Duos) I8552 
 Screenshot Samsung Galaxy Grand Quattro (Win Duos) I8552 

Samsung Galaxy Grand Quattro (Win Duos) I8552


OS: Android v4.1.2 (Jelly Bean)

CPU: Quad core, 1.2 GHz, Cortex A5
RAM: 1 GB
Display: 4.7 inches (11.94 cm)
Battery: 2000 mAh


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.
  • fter 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 instructions on the computer screen.
  • Click the Next button and follow the instructions on the screen. After starting 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 up/down buttons to navigate through the menu options, select Recovery and press the power button.
  • Select Wipe data/factory reset. by using the volume up/down buttons to move through the menu and confirm the selection by pressing the power button.
  • Confirm the reset operation and reboot 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 phone is discharged.
  • When the battery has a few percent left, the phone will report this and open the menu with power settings, that is, it will unlock the phone.
  • You need to quickly find the page with security settings in the menu and disable the lock.


4. Delete 'gesture.key' and 'password.key' using Aroma File Manager.
  • Turn off your phone and prepare a memory card.
  • Transfer the Aroma File Manager program using a computer 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, find the item Install zip. Then go to Install zip from sdcard -> Choose zip from sdcard, go to the archive folder with this program and select it.
  • You need to find the /data/system folder and delete the files 'gesture.key' and 'password.key' (if you have Android 4.4 or lower) or 'getekeeper.password.key' and 'getekeeper. pattern.key' (if you have Android 5 or higher)
  • Reboot your device.


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 to regain access by entering your Google Account login password.
  • Delete in the lock screen 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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