Hard Reset SAMSUNG Galaxy J7 Core

First method:

1. At the very beginning switch off the SAMSUNG Galaxy J7 Core by using the Power key.
2. Then press and hold together: Volume Up + Home + Power key for a couple of seconds.
3. You should  let go of held keys as soon as you can see the Samsung logo.
4. The Installing System Update and No Command screen should appear on the screen.
5. Wait a few seconds until this Blue Screen disappear.
6. Select "wipe data / factory reset" by using Volume buttons to navigate and Power button to confirm.
7. Afterwards choose "Yes -- delete all user data" to confirm the whole operation.
8. Excellent! Now the device is formatting itself.
9. As soon as the Recovery Mode menu appears again select option "reboot system now".
10. Well done! The hard reset has just been performed.

Second method:

1. Switch on the SAMSUNG Galaxy J7 Core by holding down the Power button.
2. Then rom the Home Screen go to Menu and then to Settings.
3. Afterwards find and select Backup & Reset .
4. Tap Factory Data Reset and then Reset device.
5. To confirm your choice select Erase everything.
6. Good job! Wait to complete the operation and then set up the smartphone.

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WARNING !
Hard Reset will erase all of your data
All described operations you are doing at your own risk.